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3Com 3C840 User Manual

3Com 3C840 User Manual

3com remote 840 sdsl router user's guide
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OfficeConnect™ Remote
840 SDSL Router User's
®
Guide
Release 1.2.0
http://www.3com.com/
Part No. 10031396 Rev. AA
May 2000

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  • Page 1 OfficeConnect™ Remote 840 SDSL Router User’s ® Guide Release 1.2.0 http://www.3com.com/ Part No. 10031396 Rev. AA May 2000...
  • Page 2 3Com Corporation reserves the right to revise this documentation and to make changes in content from time 95052-8145 to time without obligation on the part of 3Com Corporation to provide notification of such revision or change. 3Com Corporation provides this documentation without warranty, term, or condition of any kind, either implied or expressed, including, but not limited to, the implied warranties, terms or conditions of merchantability, satisfactory quality, and fitness for a particular purpose.

  • Page 3: Table Of Contents

    BOUT UIDE Introduction How to Use This Guide Conventions Document Notation Safety Information Additional Safety Information Year 2000 Compliance VERVIEW Introduction 1 - 1 What Is the OfficeConnect Remote 840? What is an SDSL Modem? 1 - 3 What is ATM? 1 - 3 What is Frame Relay? 1 - 3...
  • Page 4 Back Panel 1 - 11 Configuration Overview 1 - 13 General Configuration Steps How to Manage the OfficeConnect Remote 840 Starting the OfficeConnect Remote 840 Manager OfficeConnect Remote 840 Manager Menus Using the OfficeConnect Remote 840 Manager Document Notation 1 - 16 Online Help 1 - 17 Where to Find More Configuration Information...
  • Page 5 Adding a Remote Site Profile Modifying a Remote Site Profile Deleting a Remote Site Profile Configuring Network Service Information (PPP / RFC 1483 / RFC 1490) Frame Relay 3 - 5 Configuring ATM Information ATM Modify Screen 3 - 6 Configuring Protocol Parameters Monitoring Remote Site Connections IP R...
  • Page 6 Ping Responses 4 - 15 DNS Errors 4 - 15 Option 2: DOS Ping to ISP or Remote Site Network Option 3: Internet Browser (Internet Access Only) Advanced Troubleshooting ONFIGURING RIDGING Introduction 5 - 1 Overview 5 - 1 Configuring Bridging for the LAN Adding a Bridge Network Modifying or Deleting a Bridge Network Configuring Bridging for the Remote Site Connections...
  • Page 7 Configuring the PAT Default Address Configuring Static PAT Port Entries Configuring NAT 6 - 4 Monitoring 6 - 5 DHCP ONFIGURING Introduction 7 -1 DHCP Overview 7 -1 Configuring the DHCP Mode Configuring the DHCP Server Configuring the DHCP Relay Monitoring DHCP 7 -4 DHCP Smart Mode Overview...
  • Page 8 Configuring IPX for Remote Sites Connection Configure the Remote Site IPX Network Information Configuring IPX Static and Framed Routes Adding a Static IPX Route to the Local Site (LAN) Adding a Framed IPX Route to a Remote Site (WAN) Configuring IPX Static and Framed Services Adding a Static IPX Service to a Local Site (LAN) Adding a Framed IPX Service to a Remote Site (WAN) Configuring IPX RIP and SAP...
  • Page 9 11 - 5 Interface Status 11 - 5 ATM Status 11 - 5 ATM Cell Status 11 - 5 SDSL Transceiver Status Remote Site Connection 11 - 7 Connection Traffic/Error Counters ATM Site Counters 11 - 7 Frame Relay VC Site Counters Remote Site Status Table 11 - 8 IP Networks...
  • Page 10 Filtering Overview 12 - 1 Filtering Capabilities 12 - 2 Filter Classes 12 - 2 Filter Types 12 - 2 Data Filters 12 - 2 Advertisement Filters 12 - 3 Generic Filters 12 - 3 Creating Filters Overview 12 - 4 Creating Filters Using the OfficeConnect Remote 840 Manager OfficeConnect Remote 840 Manager Filter Screens Filter Screens...
  • Page 11 RIDGING AND OUTING Introduction A -1 Bridging and Routing Concepts Guidelines for Choosing Bridging or Routing How Bridges Learn A -2 Bridging Between Remote Sites Building a Larger Network Multiple Paths Between Bridge LANs Network Topology A -6 Broadcast Storms A -6 Optimum Use of Resource Network Organization, Structure, and Physical Layout...
  • Page 12 DDRESS RANSLATION Overview C -1 Network Address Translation (NAT) NAT Example C -2 Dynamic NAT C -3 Static NAT C -4 Port Address Translation (PAT) PAT Example C -4 Dynamic PAT C -5 Static PAT C -5 Default PAT C -6 CLI G SING THE UIDE...
  • Page 13 Testing the Configuration E - 14 TECHNICAL SUPPORT Online Technical Services F - 1 World Wide Web Site F - 1 Support from Your Network Supplier Support from 3Com F - 2 Returning Products for Repair ORPORATION IMITED FCC C LASS TATEMENT...
  • Page 15 BOUT UIDE Introduction This guide describes the features and advanced configuration of the OfficeConnectRemote 840 SDSL Router. The guide is intended for both first-time and experienced computer network users who are using the OfficeConnectRemote 840. For information on the initial configuration of the unit, see the OfficeConnect Remote 840 SDSL Router Installation Guide (included in the box when your purchased your Router).
  • Page 16 Information on using the CLI Guide Information on Configuration Information on Technical Support These and other user guides and release notes are available in Adobe Acrobat Reader Portable Document Format (PDF) or HTML on the 3Com World Wide Web site: http://www.3com.com/ocr840 Conventions Table 1 and Table 2 list conventions that are used throughout this guide.
  • Page 17 Table 2 Text Convention Convention Screen displays This typeface represents information as it appears on the Syntax Commands The words “enter” and “type” Keyboard key names If you must press two or more keys simultaneously, the key Words in italics Document Notation References to specific OfficeConnect Remote 840 Manager pages in this document will use a specific notation to describe the location of a page...
  • Page 18 Products manufactured by 3Com are safe and without risk provided they are installed, used, and maintained in good working order and in accordance with their instructions and recommendations.
  • Page 19 See the printed installation guide for additional important safety Information information. Year 2000 For information on Year 2000 compliance and 3Com products, visit the Compliance 3Com Year 2000 web page: http://www.3Com.com/products/yr2000.html Do not use a telephone that is connected to the unit (other than a cordless type) during an electrical storm.
  • Page 20 BOUT UIDE...

  • Page 21: Introduction

    Introduction This chapter provides an overview of the OfficeConnect Remote 840. It contains the following sections: VERVIEW “What Is the OfficeConnect Remote 840?” “What is an SDSL Modem?” “What is ATM?” “What is Frame Relay?” “What is a BRouter?” “What is a Remote Site?” “What is RFC 1483”...

  • Page 22: What Is The Officeconnect Remote 840?

    1: O HAPTER VERVIEW What Is the The OfficeConnect Remote 840 is a stand-alone BRouter with data OfficeConnect interfaces to a Local Area Network (LAN) and a Wide Area Network Remote 840? (WAN). The Symmetric Digital Subscriber Line (SDSL) port composes the WAN interface, which can support Point-to-Point protocol (PPP), RFC 1483, or RFC 1490 connections.

  • Page 23: What Is An Sdsl Modem?

    protocols as well as bridging, with support for learning bridge and 802.1d spanning tree functionality to eliminate loops. Other important features include: Routing Information Protocol (RIP), Simple Network Management Protocol (SNMP), address translation, telnet, and packet filtering. The web browser-based OfficeConnect Remote 840 Manager and the IP Wizard provide a user-friendly configuration interface.

  • Page 24: What Is A Brouter?

    1: O HAPTER VERVIEW What is a BRouter? A BRouter is an interface between two networks, functioning as a router and/or a bridge. A router finds the best route between networks and provides network management capabilities. The OfficeConnect Remote 840 is a protocol independent router that does not rely on the workstations on a LAN for routing information, such as the destination location and best route.

  • Page 25: What Is A Remote Site?

    MAC layer addresses are pre-pended in the ethernet header over the Wide Area Connections. Address Resolution procedures (ARP), are used to dynamically learn the MAC address of the remote router. What is a Remote The OfficeConnect Remote 840 can be configured to route IP or IPX, Site? and/or bridge other protocols between workstations on the Local Area Network (LAN) and up to 16 remote locations over an ATM or Frame...

  • Page 26: What Is Rfc 1483

    1: O HAPTER VERVIEW within the same subnet. When the local side of the WAN interface has an assigned address, it is referred to as being "numbered." Otherwise, it is referred to as "unnumbered." For a more in-depth description of “numbered” versus “unnumbered” interfaces, see Appendix B, “IP Addressing”.

  • Page 27: Benefits Of Using Rfc 1483

    connection. RFC 1483 is a conduit for multiple protocols such as IP and IPX, which are encapsulated and passed across the communications datalink. The OfficeConnect Remote 840 supports RFC 1483 and can establish a RFC 1483 connection to other devices supporting RFC 1483. Benefits of Using RFC RFC 1483 offers interoperability of multi-vendor equipment and 1483...

  • Page 28: What Is Dns?

    PPP or can be statically assigned. The OfficeConnect Remote 840 can be configured as a DNS proxy. A static local host entry of ocrdsl-3com.com is configured for the OfficeConnect Remote 840 by default. Therefore, the OfficeConnect Remote 840 can be easily accessed with a web browser, by typing in ocrdsl-3com.com in the location or address field in the browser.

  • Page 29: What Is Default Bridge Mode?

    you choose this boot option, you will set up your workstation(s) for automatic IP address assignment. What Is Default The second operational mode is Default Bridge Mode. This mode Bridge Mode? preconfigures the unit to bridge all packets. The unit can be automatically set up so that you will not be required to fill out any forms, use Setup Wizard, or install any software from the CD unless you want to change the configuration.

  • Page 30: Officeconnect Remote 840 Panel Features

    1-10 1: O HAPTER VERVIEW OfficeConnect All LED and status information can be found on the front panel of the Remote 840 Panel unit, while the power jack and ports are located on the back of the unit. Features Front Panel Below is a representation of the front panel of your unit: Figure 1–4 OfficeConnect Remote 840 Front Panel Table 1–1 LED definitions...

  • Page 31: Back Panel

    Back Panel Below is a representation of the back panel of your SDSL router: Figure 1–5 OfficeConnect Remote 840 Back Panel Power Inlet — The power port attaches to an external, 15-volt DC power supply included with the OfficeConnect Remote 840 package. The other end of the power supply cable connects to a standard electrical socket.
  • Page 32 1-12 1: O HAPTER VERVIEW Table 1–2 DIP Switch Modes off off off off off off off off off All other configurations: Unconfigured Mode configurations. See the table below for information about which switches to set for which configurations. DIP Switch Mode Default Bridge Mode, Frame Relay, DLCI = 528, data encapsulated over RFC 1483.

  • Page 33: Configuration Overview

    Configuration The OfficeConnect Remote 840 configuration is divided into three areas: Overview Local Site (LAN), Remote Site (WAN), and Global configuration. The following shows the areas of configuration for each. To successfully configure the OfficeConnect Remote 840 to route or bridge a network, you should perform the following steps.

  • Page 34: How To Manage The Officeconnect Remote 840

    1-14 1: O HAPTER VERVIEW How to Manage the You can manage the OfficeConnect Remote 840 either through the OfficeConnect Command Line Interface (CLI) or through a web browser. If you choose to Remote 840 manage the unit through CLI, see the OfficeConnect Remote 840 SDSL Router CLI User's Guide, included on the CD shipped with your unit.

  • Page 35: Starting The Officeconnect Remote 840 Manager

    If you initially configured your unit with DHCP Smart Mode, your unit will have an IP address of 192.168.200.254 and a DNS host name of ocrdsl-3com.com. When prompted to login to the unit, enter the administrative login name and password. After successful authentication, you will access the OfficeConnect Remote 840 Manager "home page."...

  • Page 36: Using The Officeconnect Remote 840 Manager

    1-16 1: O HAPTER VERVIEW Using the All OfficeConnect Remote 840 Manager screens have three basic areas: OfficeConnect Remote 840 Manager Quick Link Area To access a particular OfficeConnect Remote 840 Manager page follow the links through the menu hierarchy in the Main area. You can use the Quick Link area to quickly get back to the top of the menu hierarchy or to one of the five menu options selections.

  • Page 37: Online Help

    Online Help The OfficeConnect Remote 840 Manager provides two methods of obtaining help. The Online User’s Guide and HTML help screens are not part of the OfficeConnect Remote 840 operational software. They must be installed on each workstation where you will run your OfficeConnect Remote 840 Manager browser.
  • Page 38 1-18 1: O HAPTER VERVIEW...

  • Page 39: Performing System Administration Tasks

    Performing System This section describes the details for performing the following System Administration Administration OfficeConnect Remote 840 Manager tasks: Tasks Controlling Login This allows you to set up management access security. The configured and Telnet Access username and password combination allows web browser and Telnet access.

  • Page 40: Adding A Login

    2: S HAPTER YSTEM DMINISTRATION Adding a Login 1 From the home page, select Configuration > Global > Administrator > Login. Click Add. The following screen fields appear: 2 Enter the following fields: 3 After the fields have been entered, click Submit. To clear the fields, click Reset.

  • Page 41: Modifying The Date And Time

    Modifying the Date This allows you to modify the system date and time. and Time 1 From the home page, select Configuration > Global > Administrator > Date and Time. The screen with the following fields appear: 2 Enter the date and time information, utilizing the correct formats as shown next to the fields.

  • Page 42: Using The Officeconnect Remote 840 Manager To Restore Defaults

    2: S HAPTER YSTEM DMINISTRATION Using the 1 Select Tools > Reboot. OfficeConnect 2 Select the Delete all configuration and reboot device information Remote 840 Manager to Restore 3 Click Submit. Defaults 4 Wait one minute. Then, configure an IP address if DHCP Smart Mode is 5 Open up the web browser and start the OfficeConnect Remote 840 Using the Reset 1 Turn the OfficeConnect Remote 840 off by unplugging the unit.
  • Page 43 SNMP access is provided by an SNMP community name and access mode. To Download the Management Information Base (MIB) files, go to the website, http://www.3com.com/support/ocr840/index.html, and click the drop-down menu under software/MIB downloads. To set up an SNMP community on the OfficeConnect Remote 840, follow these instructions: 1 From the home page, select Configuration >...

  • Page 44: Controlling Tftp Access

    2: S HAPTER YSTEM DMINISTRATION 4 Repeat steps 1-3 for each management station which is a part of this community. Be careful to have the Access box checked the same for each new member of the community. The entire community will be given the access rights of the last member. 5 To alter previously set Access Rights, follow step 1 and select the community from the community list and click Modify.

  • Page 45: Assigning Snmp Trap Managers

    Assigning SNMP An SNMP trap is an event that causes the OfficeConnect Remote 840 to Trap Managers send an unsolicited message to a SNMP manager. These events are generally critical events that indicate an operational problem. (Critical events can also be viewed on the OfficeConnect Remote 840 Manager's Monitor >...

  • Page 46: Assigning Syslog Managers

    2: S HAPTER YSTEM DMINISTRATION Assigning Syslog A Syslog manager is a workstation that accepts and saves informational Managers messages from a network device. The OfficeConnect Remote 840 Manager can be configured to send log messages to a syslog manager as follows: 1 From the home page, select Configuration >...

  • Page 47: Remote Site Overview

    Introduction This chapter provides an overview on managing remote site profiles using the web browser based OfficeConnect Remote 840 Manager. If you need information on setting up or initially configuring the unit, see the OfficeConnect Remote 840 SDSL Router Installation Guide. This section is divided into the following parts: Remote Site To set up connections over the WAN, a remote site profile must be...

  • Page 48: Managing A Remote Site Profile

    3: R HAPTER EMOTE If you need to connect to multiple remote sites such as the Internet and a remote office, you should set up a remote site profile for each location. Managing a Once created, remote site profiles can be enabled or disabled. When a Remote Site Profile profile is enabled, the OfficeConnect Remote 840 reads the connection parameters for the remote site from the profile and continuously...

  • Page 49: Modifying A Remote Site Profile

    4 Click Add. Then click Save Configuration on the sidebar to permanently save the changes. The Network Service (PPP and RFC 1483/ RFC 1490), ATM, and network protocol (Bridging, IP, and IPX) information has not been configured yet. To make a connection with the remote site you must configure the Network Service, ATM, and at least one network protocol.

  • Page 50: Configuring Network Service Information (Ppp / Rfc 1483 / Rfc 1490)

    3: R HAPTER EMOTE Configuring A Network Service defines the data encapsulation and protocol Network Service characteristics for the connection between two packet switching devices. Information (PPP / The OfficeConnect Remote 840 supports PPP, RFC 1483 and RFC 1490 RFC 1483 / RFC Network Services.

  • Page 51: Frame Relay

    Configuring Network Service Information (PPP / RFC 1483 / RFC 1490) 4 Select the network service to be either RFC 1483, or PPP. If PPP, enter the Authentication Name and Authentication Password provided to you. You can change the header compression from the default of none to TCP/IP if you wish.

  • Page 52: Configuring Atm Information

    3: R HAPTER EMOTE 6 Check the Enable Remote Site box. Configuring ATM The ATM parameters are supplied by your service provider. These Information parameters consist of: ATM allows for permanent connections (PVCs) and switched connections (SVCs). For a PVC, the required VC information parameters consist of the Virtual Path Identifier (VPI) and Virtual Channel Identifier (VCI).
  • Page 53 If PVC is selected, enter the VPI and VCI. VPI — The Virtual Path Identifier (VPI) is part of the cell header for the cells that are transferred over this connection. VCI — The Virtual Channel Identifier (VCI) is part of the cell header for the cells that are transferred over this connection.

  • Page 54: Configuring Protocol Parameters

    3: R HAPTER EMOTE If no traffic shaping parameters have been provided you should choose the default parameter of UBR with a PCR value of 0. The OfficeConnect Remote 840 will attempt to use all of the upstream bandwidth when transmitting data to the remote site.

  • Page 55: Overview

    Introduction This chapter contains information on configuring routing for IP protocol using the OfficeConnect Remote 840. It is divided into the following sections: Overview The OfficeConnect Remote 840 can be configured as a router to forward packets between the local LAN interface and one or more Remote Sites. The router maintains a forwarding table.

  • Page 56: Enabling Ip Routing

    4: C IP R HAPTER ONFIGURING To configure IP routing, IP must be defined on both the LAN interface and one or more remote sites. On the LAN, an IP network must exist and it must have a specified IP address and subnet mask. On the remote sites, IP routing needs to be enabled, and the remote router address, a remote subnet mask and local WAN interface address need to be configured.

  • Page 57: Adding A Local Ip Network

    For routing to take place across the OfficeConnect Remote 840, you also have to set up a corresponding network over the WAN port (see “Configuring IP for the Remote Site Use the Configuration > Local Site (LAN) > IP screen to define or modify all IP networks over the LAN.

  • Page 58: Resetting Parameters

    4: C IP R HAPTER ONFIGURING Resetting Parameters If you need to return to the original parameters for this screen, click Reset before you click Add. Modifying or To modify information pertaining to an existing IP network, or to delete Deleting an IP that information from your configuration, follow these steps: Network...

  • Page 59: Configuring Ip Rip On The Lan

    Configuring IP RIP RIP is utilized as a means of communicating routing information between on the LAN routers. This is done to keep the routers updated on information. Local Site (LAN) RIP The RIP options for the LAN can be accessed through Configuration > Local Site >...

  • Page 60: Resetting Parameters

    4: C IP R HAPTER ONFIGURING This brings up a screen containing the following fields: 1 You may enter the following fields: 2 Under the following two categories, you may customize your RIP: 3 Click Submit when the fields have been entered to save your customizations.

  • Page 61: Configuring Ip For The Remote Site Connection

    Configuring IP for To set up connections over the WAN, a remote site profile must be the Remote Site created and edited for each remote location you want to connect to. Connection With this profile, you specify ATM virtual circuit information, protocols, and addresses that determine the method of connection and communication to that remote site.

  • Page 62: Configure The Remote Site Ip Network Information

    4: C IP R HAPTER ONFIGURING Configure the The following steps illustrate how you configure the remote site IP Remote Site IP network information. Network Information 1 Complete the following entries: Local WAN IP Address: OUTING If you were provided a single IP address, select Specified and enter that address.
  • Page 63 Configuring IP for the Remote Site Connection Remote WAN IP Address: If you were provided a remote IP address and netmask, select Specified and type in that address and netmask. If the OfficeConnect Remote 840 is learning the remote IP address from the remote site (PPP only), select Learn from Remote.

  • Page 64: Configuring Ip Rip On A Remote Site

    4-10 4: C IP R HAPTER ONFIGURING Configuring IP RIP Access the RIP options for the WAN through Configuration > Remote on a Remote Site Sites > IP. 1 Select a defined remote site connection from the list and click Modify. Keep clicking Next until you advance to the IP Modify screen.

  • Page 65: Configuring Ip Static And Framed Routes

    Configuring IP A Static route is a configured route that will remain in the routing table Static and Framed until deleted. Static routes differ from Dynamic routes in that Dynamic Routes routes are learned real-time via RIP. A Framed route is much like a static route in that you manually configure the route.

  • Page 66: Using Ip Address Validation

    4-12 4: C IP R HAPTER ONFIGURING 4 Click Manage in the Framed Routes box. 5 Click Add to define the following parameters: 6 After you have entered the fields, click Submit. 7 Click Modify to change the fields, the Details button to view the fields, and the Delete button to erase the parameters you have set.

  • Page 67: Mac-Encapsulated Routing

    Using IP Address Validation 4-13 Check or uncheck the IP Source Validation button to respectively enable or disable the IP source validation. MAC-Encapsulated MAC-Encapsulated Routing combines routing and bridging so that Routing routing features (i.e., Address Translation, DNS Proxy, DHCP Server, etc.) are available in a bridged environment.

  • Page 68: Monitoring

    4-14 4: C IP R HAPTER ONFIGURING Monitoring The OfficeConnect Remote 840's IP Routing Table is displayed by accessing the following page: Monitor > Routes and Services > IP Routes. Global IP counters can be displayed through Monitor > Networks > IP > IP Counters.

  • Page 69: Ping Responses

    A Ping Response screen will appear, with the response from the ping. The following responses may occur. Ping Responses <IPAddress> is alive The PING was successful. If a name was entered in the Ping page input field, the corresponding IP address is displayed on the Response page. PING: no route to host A valid IP address or name was entered but the routing table does not indicate how to reach the network that the IP address belongs to.

  • Page 70: Option 2: Dos Ping To Isp Or Remote Site Network

    4-16 4: C IP R HAPTER ONFIGURING Option 2: DOS Ping to From the a workstation on the local LAN, get to an MS-DOS prompt and ISP or Remote Site type ping <remote IP address> <Enter> where the remote IP address is Network the address of a host on the remote network (Ex: ping 10.0.0.12).
  • Page 71 Access Only) page comes up, all is configured correctly and you are on your way! Advanced If the 3Com web site home page does not appear, the problem may be Troubleshooting incorrect DNS server addresses on your workstation. For more detailed troubleshooting information, see “Troubleshooting”.
  • Page 72 4-18 4: C IP R HAPTER ONFIGURING OUTING...

  • Page 73: Introduction

    Introduction This chapter contains information on configuring bridging for the OfficeConnect Remote 840. If you need more information on the difference between Bridging and Routing, and which one is best for your needs, see Appendix Overview A bridge connects two or more LANs together at Layer 2 (data link) of the ISO-OSI 7 layer model.
  • Page 74 5: C HAPTER ONFIGURING RIDGING To efficiently separate traffic, the bridge maintains a Bridge Forwarding Table. The table contains a list of MAC addresses and their associated network segments. The table is built dynamically from the source MAC addresses of data packets passing through the bridge. The OfficeConnect Remote 840 bridge supports the Spanning Tree Protocol (STP).

  • Page 75: Configuring Bridging For The Lan

    Configuring To configure a protocol over the LAN, you need to assign a protocol Bridging for the network to the LAN port by providing a name. After adding a network, you can modify advanced parameters. The network's status appears in the Monitor >...

  • Page 76: Modifying Or Deleting A Bridge Network

    5: C HAPTER ONFIGURING Modifying or To modify information pertaining to an existing Bridge network, or to Deleting a Bridge delete that information from your configuration, follow these steps: Network 1 Proceed to the Bridge screen, following steps 1 and 2 above. 2 Select the bridge network you wish to modify or delete.

  • Page 77: Enabling Bridging

    For any routing to take place across the OfficeConnect Remote 840, you also have to set up a corresponding network over the LAN. See “Configuring Bridging for the Enabling Bridging These instructions assume you have already added a remote site profile. If you have not added one, select Add instead of Modify in step 1 and see “Remote Site Management”...

  • Page 78: Mac-Encapsulated Routing

    5: C HAPTER ONFIGURING IP Forwarding refers to the routing of IP packets from one interface to another. It does not affect communicating to the OfficeConnect Remote 840 itself. Even when IP Forwarding is disabled, you can perform non-routing functions such as use the OfficeConnect Remote 840 Manager from a Web browser and use PING.

  • Page 79: Bridge Firewall

    the routed protocols configured by the profile (i.e., IP and/or IPX) will be sent using the appropriate bridged encapsulation. If the configured Network Service is PPP, the packets will be encapsulated in BRCP. MAC-Encapsulated Routing is configured on the Remote Sites General screen.
  • Page 80 5: C HAPTER ONFIGURING RIDGING IPX routing is enabled if an IPX network is present over the Ethernet interface (see enabled by adding a bridge network over the Ethernet interface (see “Configuring Bridging for the for each destination in its remote site profile. When configured for simultaneous bridging and routing, packets received from the LAN are first passed through the router for any configured protocols.

  • Page 81: Advanced Bridging Options

    In general, a packet received in a routed encapsulation (i.e., IPCP or routed RFC 1483 or RFC 1490) is delivered to the router. A packet received in a bridged encapsulation is passed to the bridge. If MAC-Encapsulated Routing is enabled, the received (bridge-encapsulated) packets are delivered to the router.

  • Page 82: Default Bridge Mode

    5-10 5: C HAPTER ONFIGURING If you need to return to the original parameters for this screen, click Reset before you click Submit. 3 Click Submit when the fields have been entered to save your customizations. Default Bridge Mode Default Bridge Mode Default Bridge Mode is designed for those who want to use their Overview OfficeConnect Remote 840 to function as a bridge automatically, with no...

  • Page 83: Installing The Officeconnect Remote 840 Using Default Bridge Mode

    You will need to tell your service provider to use a connection on VPI / VCI using RFC 1483 or RFC 1490 (bridged). Boot options only affect the operation of a unit which does not presently have any configuration settings (i.e., the unit is new, the reset button has been clicked, or a delete configuration command has been executed from the CLI or HTML interface).
  • Page 84 5-12 5: C HAPTER ONFIGURING RIDGING If you have problems with bridging IP, check that IP Forwarding is disabled on the Configuration > Global > IP > IP Settings screen. Also, be sure that your LAN IP Addresses belong to the same IP network as the remote site.

  • Page 85: Selecting Address Translation

    Introduction This chapter contains information on address translation using the OfficeConnect Remote 840. It is comprised of the following sections: Selecting Address Translation You must have a Remote Site Profile already defined to set up address translation for this remote site. 1 From the OfficeConnect Remote 840 Manager “home page,”...

  • Page 86: Configuring The Pat Default Address

    6: N HAPTER ETWORK DDRESS 4 Under Address Translation, select Port Address Translation (PAT), Network Address Translation (NAT), or None (if you are not using address translation). If you selected PAT, you must enter the default IP address that will be used.

  • Page 87: Configuring Static Pat Port Entries

    Press the Modify button to set the address. Configuring Static Press the Static Transmission Control Protocol (TCP) or Static User PAT Port Entries Data Protocol (UDP) button to access the static port tables. Static TCP — Press this button to access the static PAT TCP table (above).

  • Page 88: Configuring Nat

    6: N HAPTER ETWORK DDRESS After Static Port Entries have been configured, return to the IP Advanced Modify screen and press the Modify button for the changes to take effect. Configuring NAT When NAT is configured, static mappings and/or dynamic pools of addresses must be configured.

  • Page 89: Monitoring

    Monitoring Monitoring If PAT is used, the active port mappings are shown in the Monitor > Networks > NAT/PAT > Port Assignments screen. Only those mappings for the specified Remote Site will be displayed. This screen shows the active port mappings for both TCP and UDP connections. Each entry consists of the public and the private ports, the remote address and port number, and the value of the inactivity timer.
  • Page 90 6: N HAPTER ETWORK DDRESS RANSLATION SING THE FFICE ONNECT EMOTE...

  • Page 91: Dhcp Overview

    Introduction This chapter provides information on configuring the DHCP options for the OfficeConnect Remote 840. DHCP Overview Dynamic Host Configuration Protocol (DHCP) is designed to provide a centralized approach to configuring IP addresses and parameters. When a workstation is configured for automatic assignment of IP addresses, it broadcasts a request out on the LAN.

  • Page 92: Configuring The Dhcp Mode

    7: C DHCP HAPTER ONFIGURING The OfficeConnect Remote 840 can be configured to support up to 40 workstations on the local LAN. In addition, the OfficeConnect Remote 840 can be configured to be a DHCP Relay. When enabled, the Relay will process the broadcast request from the local workstation and send it to one or two remote DHCP servers.

  • Page 93: Configuring The Dhcp Server

    Configuring the The DHCP Server configuration screen contains the following fields: DHCP Server The OfficeConnect Remote 840's local LAN IP address should be entered in as the IP Default Router and also as the DNS Server if the DNS Proxy functionality is enabled.

  • Page 94: Configuring The Dhcp Relay

    7: C DHCP HAPTER ONFIGURING Configuring the If you selected Relay on the main DHCP screen, press the Configure DHCP Relay DHCP Relay button. This screen contains the following fields: Enter the IP Addresses of one or two remote DHCP servers and specify the Max Hops (the maximum number of hops through other routers) to reach them.
  • Page 95 WINS Servers: 0.0.0.0 0.0.0.0 DNS Servers: 192.168.200.254 0.0.0.0 DNS Static Host entry: Domain Name: ocrdsl-3com.com IP address: 192.168.200.254 If you choose DHCP Smart Mode, you should set up the workstations on the OfficeConnect Remote 840’s LAN to automatically obtain their IP address.
  • Page 96 7: C DHCP HAPTER ONFIGURING...

  • Page 97: Dns Overview

    DNS Servers for specific domains. For instance, assume you have two remote sites configured, one to the Internet and the other to a corporate site which has a domain name of 3com.com. Two DNS remote servers can be configured, one which uses the corporate site for 3com.com and the other to use the Internet as the default.

  • Page 98: Configuring Dns

    8: C HAPTER ONFIGURING Configuring DNS To access the DNS configuration screens, go to the OfficeConnect Remote 840 Manager and select Configuration > Global > DNS. This screen contains the following fields: 1 To enable DNS services, check the Enable DNS box. 2 To specify the number of times the OfficeConnect Remote 840 will attempt to reach a primary or secondary DNS server, enter the number in the Number of Retries field.
  • Page 99 Multiple DNS remote server entries can be added. The server is chosen based on the requested domain name. If a match is not found, the default entry is chosen. The default entry has a domain name of '*'. 1 Select the DNS Server List button from the DNS page. 2 To add a new entry, click Add.

  • Page 100: Configuring Static Dns Host Entries

    8: C HAPTER ONFIGURING Configuring Static The OfficeConnect Remote 840 can function as a DNS server. DNS Host Entries 1 If you want to configure any Static DNS Entries, select Static DNS Entries and click Add. 2 Then enter the Domain Name and the Host IP Address of the machine that has that domain name and click Add.

  • Page 101: Introduction

    Introduction This chapter provides an overview on configuring IPX routing for the OfficeConnect Remote 840. Overview The OfficeConnect Remote 840 can be configured as a router to forward packets between the local LAN interface and one or more remote sites. A forwarding table is maintained that specifies which interface to route an IPX packet based on the destination IPX network number.

  • Page 102: Configuring Ipx For The Lan

    9: C IPX R HAPTER ONFIGURING Configuring IPX for To configure IPX over the LAN, assign an IPX network to the LAN port by the LAN providing a name and a network address. After adding a network you can modify advanced parameters. In order for the OfficeConnect Remote 840 to route traffic, you also have to set up a corresponding network over the WAN port.

  • Page 103: Modifying Or Deleting An Ipx Network

    Modifying or To modify information pertaining to an existing IPX network or to delete Deleting an IPX that information from your configuration, follow these steps: Network 1 Proceed to the IPX screen, following steps from the previous section. 2 Select an IPX network you wish to modify or delete. 3 Click Modify/Delete.This brings up the IP Modify/Delete screen containing the following fields: 4 You may enable or disable the selected IPX network by clicking Modify...

  • Page 104: Configure The Remote Site Ipx Network Information

    9: C IPX R HAPTER ONFIGURING If you need to connect to multiple remote sites (i.e., two remote offices) you can set up a remote site profile for each remote location. For any routing to take place across the OfficeConnect Remote 840, you also have to set up a corresponding network over the LAN.

  • Page 105: Configuring Ipx Static And Framed Routes

    5 Check the correct box in the IPX WAN Network Address box. 6 To automatically learn IPX RIPs and SAPs, set the IPX Routing option to Both. 7 Check the Enable IPX checkbox. 8 Remember to save the configuration by clicking Save on the sidebar. Configuring IPX A static route is a configured route that will remain in the routing table Static and Framed...

  • Page 106: Adding A Framed Ipx Route To A Remote Site (Wan)

    9: C IPX R HAPTER ONFIGURING 3 Define the Route by entering the following fields: 4 Click Submit. To clear the fields, click Reset. 5 To delete a route from your configuration, select the route and click Delete. Adding a Framed IPX To add, modify, or delete a framed route to a Remote Site, follow these Route to a Remote steps:...

  • Page 107: Configuring Ipx Static And Framed Services

    6 After you have entered the fields, click Submit. 7 Click Modify to change the fields, the Details button to view the fields, and the Delete button to erase the parameters you have set. Configuring IPX The services table contains IPX server names, the services they provide, Static and Framed their network and node addresses, and their relative distances.

  • Page 108: Adding A Static Ipx Service To A Local Site (Lan)

    9: C IPX R HAPTER ONFIGURING Adding a Static IPX To add a static IPX Service to a LAN: Service to a Local Site (LAN) 1 Select Configuration > Global > IPX > IPX Services. 2 Click Add to define the following parameters of a static service: 3 After you have entered the fields, click Add.

  • Page 109: Adding A Framed Ipx Service To A Remote Site (Wan)

    Adding a Framed IPX To add, modify, or delete a framed service for a remote site: Service to a Remote Site (WAN) 1 Select Configuration > Remote Sites (WAN). 2 Select the remote site to modify, and click Modify. 3 Continue clicking Next to advance through the ATM Modify, IP Modify, IP Advanced Modify screens to get to the IPX Modify screen.

  • Page 110: Configuring Ipx Rip And Sap

    9-10 9: C IPX R HAPTER ONFIGURING Configuring IPX RIP RIP is utilized as a means of communicating routing information between and SAP routers. This is done to keep the routers updated on information. Service Advertising Protocol (SAP) is a protocol used by IPX servers and routers to exchange information about the location of servers.

  • Page 111: Remote Site (Wan) Rip And Sap

    Remote Site (WAN) IPX RIP and SAP parameters can be configured on the remote site IPX RIP and SAP Modify screen. Access this screen by going to the OfficeConnect Remote 840 home page. 1 Select Configuration > Remote Sites (WAN), and click Modify. This will access the Remote Sites General Modify Screen.

  • Page 112: Ipx Routing Configuration To Support Mac-Encapsulated Routing

    9-12 9: C IPX R HAPTER ONFIGURING IPX Routing Media Access Control (MAC)-Encapsulated Routing combines routing Configuration to and bridging so that routing features (i.e., Address Translation, DNS Proxy, Support DHCP Server, etc.) are available in a bridged environment. MAC-Encapsulated There are no specific changes required in the IPX routing configuration to Routing support MAC-Encapsulated Routing.
  • Page 113 IPX Testing 9-13 For more information on these monitoring screens, see “Monitoring the OfficeConnect Remote 840” in Chapter 11.
  • Page 114 9-14 9: C IPX R HAPTER ONFIGURING OUTING...

  • Page 115: Obtaining Updated Officeconnect Remote 840 Software

    FLASH memory on the OfficeConnect Remote 840. The method of obtaining the latest versions of the OfficeConnect Remote 840 Operational Software is either via the 3Com website, www.3com.com/ocr840 or via the CD. Install the latest version software from the website or the OfficeConnect Remote 840 CD. Type show system, using the CLI interface, to verify the version software installed on your OfficeConnect Remote 840.

  • Page 116: Officeconnect Remote 840 Cd

    The OfficeConnect Remote 840 operational software (the *.nac file) included on the CD is copied to your hard drive and not the OfficeConnect Remote 840 unit. It is installed to C:\Program Files\3Com\ocr840. Installing After you have obtained the operational software using one of the...

  • Page 117: Installing Software Via Dos

    browser with the pathname of the new NAC file. The browser will then load this file into the unit's FLASH memory. Finally, you will reboot the unit to allow the new operational software to become active. The software update process does not change configuration of the OfficeConnect Remote 840.
  • Page 118 5 Change to the directory containing the new operational software. If you obtained the software from the Installation CD or using Instant Update the default directory is c:\Program Files\3Com\ocr840. The DL.BAT batch file uses the Com 1 port by default. You can change the port used by editing the DL.BAT file.

  • Page 119: Throughput Performance

    Introduction This chapter describes the details for performing the system monitoring on the OfficeConnect Remote 840. Overview The OfficeConnect Remote 840 Manager provides a wide range of monitor screens, including real-time throughput graphs, routing tables, and interface and protocol counters. The screens help to troubleshoot connection problems and are grouped by topic below.
  • Page 120 11-2 11: M HAPTER ONITORING THE FFICE ONNECT EMOTE The throughput is displayed as line graphs that move from left to right across the screen. The color-coded list of remote site names to the right of the graphs correspond to the colored lines on the graph. A maximum of four remote sites are monitored simultaneously.

  • Page 121: Ethernet Interface

    Ethernet Interface 11-3 Figure 11–1 Throughput Graphs Ethernet Interface Interface Status The Interface Status screen provides real-time information about the interfaces. To bring up this screen, from the OfficeConnect Remote 840 Manager home page, select Monitor > Interface Status. Ethernet interface information is displayed in the row containing the interface name eth:1.

  • Page 122: Ethernet Counters

    11-4 11: M HAPTER ONITORING THE FFICE ONNECT EMOTE Ethernet Counters The Ethernet counters screen shows real-time counters based on data packets that cross the Ethernet interface. Access this screen from the OfficeConnect Remote 840 Manager home page by selecting Monitor > Ethernet.

  • Page 123: Interface Status

    11-5 Interface Status ATM Status The Interface Status screen provides real-time information about the interfaces. To bring up this screen, from the OfficeConnect Remote 840 Manager home page, select Monitor > Interface Status. ATM interface information is displayed in the row containing the interface name atm:1 or hdlc:1.

  • Page 124: Sdsl Transceiver Status

    11-6 11: M HAPTER ONITORING THE FFICE ONNECT EMOTE The information includes Cell Delineation status, Data and Idle Cell counters, and error detection, all of which are used to determine the health of your ATM link. A few error counts are not unusual but errors which increment consistently should be reported to your service provider.

  • Page 125: Remote Site Connection

    Remote Site Connection Connection You can view remote site connection traffic and error counters. From the Traffic/Error Counters OfficeConnect Remote 840 Manager home page select Monitor > Remote Sites > Remote Site Counters. Then select the remote site name from the list and press the Show button. The counters include the number of packets and bytes transmitted and received and error counters.

  • Page 126: Frame Relay Vc Site Counters

    11-8 11: M HAPTER ONITORING THE FFICE ONNECT EMOTE Frame Relay VC Site Counters Remote Site Status To view a complete list of configured remote site profiles and their status, Table access the Remote Site Status screen by selecting Monitor > Remote Sites >...

  • Page 127: Arp Table

    11-9 and the network address assigned to the connection. IP and IPX WAN network names incorporate the name of the remote site profile. Below is an example of a network status table. IP Routing Table: The IP routing table contains the list of all IP routes known by the OfficeConnect Remote 840.

  • Page 128: Dhcp

    11-10 11: M HAPTER ONITORING THE FFICE ONNECT EMOTE IP, TCP, UDP, ICMP The OfficeConnect Remote 840 Manager provides various counters and Counters and Tables tables for the IP, TCP, UDP and ICMP protocols. To get to the counter and table screens, go to the OfficeConnect Remote 840 Manager home page and select Monitor >...

  • Page 129: Dhcp Counters

    Address Translation 11-11 Each lease table entry lists the IP address and lease duration assigned to each client hardware (MAC) address. DHCP Counters You can obtain detailed statistics and error counters for the DHCP protocol. Access this screen from the OfficeConnect Remote 840 Manager home page by selecting Monitor >...
  • Page 130 11-12 11: M HAPTER ONITORING THE FFICE ONNECT EMOTE location. The mapped addresses table keeps track of private-to-public address mappings. Table The OfficeConnect Remote 840 address translation process also creates a of Port Assignments dynamic port assignment table when NAT or PAT is used. To access this table from the OfficeConnect Remote 840 Manager home page, select Monitor >...

  • Page 131: Ipx Networks

    IPX 11-13 IPX Networks IPX networks are created when you configure IPX over the LAN and when a remote site connection is established that is configured to route IPX traffic. To view the list of IPX networks and their status, bring up the Network Status screen.

  • Page 132: Ipx Services

    11-14 11: M HAPTER ONITORING THE configured statically. The protocol type of RIP indicates routes that were learned from IPX RIP information exchange with other routers. IPX Services The IPX services table contains the list of all IPX servers known to the OfficeConnect Remote 840.

  • Page 133: Forwarding Table

    Events Logs 11-15 The screen capture below provides an example of the network status table. Forwarding Table The bridge forwarding table is used for forwarding packets and contains the list of learned media access control (MAC) addresses. To access this table, go to the OfficeConnect Remote 840 home page and select Monitor >...

  • Page 134: Connection Event Log

    11-16 11: M HAPTER ONITORING THE FFICE ONNECT EMOTE Connection Event Log The connection event log contains a text description of WAN interface events. This includes cell delineation detection as well as the progress of remote site connections. To access this log, from the OfficeConnect Remote 840 Manager home page, select Monitor >...

  • Page 135: Filtering Overview

    Introduction The OfficeConnect Remote 840 provides an extensive set of data filtering capabilities. For instance, filters can accept packets only from specific addresses to provide added security, or filters can be added to reduce network traffic and improve overall performance. This chapter contains information on the filtering capabilities for your OfficeConnect Remote 840.

  • Page 136: Filtering Capabilities

    12-2 12: C HAPTER ONFIGURING Filtering The OfficeConnect Remote 840 provides an extensive set of data filtering Capabilities capabilities. The OfficeConnect Remote 840 supports the following filtering capabilities: Filter Classes The OfficeConnect Remote 840 supports three filter classes: Each filter class can be identified further by the following types: Filter Types Filters can be classified by the following types: Data Filters...

  • Page 137: Advertisement Filters

    Table 12–1 Data Filters Filter Bridge Advertisement Filters Advertisement filters operate on network protocol packets that contain varying information such as SAP or RIP. Filtering of these packets is performed by the specific protocol process. The following table describes the advertisement filters supported: Table 12–2 Advertisement Filters Filter IP-RIP...

  • Page 138: Creating Filters Overview

    12-4 12: C HAPTER ONFIGURING Creating generic filters can be a complex task. Only experienced users should employ generic filters, and strictly in cases where data and advertising filters cannot provide the filtering capabilities that you require. Creating Filters Filters can be set one of two ways in the OfficeConnect Remote 840: Overview The more flexible way of setting filters is through the Command Line Interface (CLI).
  • Page 139 Creating Filters Using the OfficeConnect Remote 840 Manager 12-5 The first is the direction/location of the packet. There are four static direction/locations on which filters can be activated: incoming LAN traffic, outgoing LAN traffic, incoming WAN traffic and outgoing WAN traffic. Additionally, there are two for each Remote Site, traffic coming from and going to each one.
  • Page 140 12-6 12: C HAPTER ONFIGURING ILTERS Example: To prevent seven individual PCs on the LAN from accessing a remote site, create the following two filters: Filter for Packets: Going to Remote Site Vienna Filter Name: Block PCs 1-6 Protocol: IP Enabled: Yes Discard Packet if IP Source Address is Equal to 192.168.200.41 or if IP Source Address is Equal to 192.168.200.50 or if IP Source Address is Equal to 192.168.200.66...

  • Page 141: Filter Screens

    to. This allows you to go beyond the bounds of the “canned” condition sentences. An overview and description of each filter screen is provided below: You can get out of any screen by using the HTML side bar links. If you are in the process of creating a new filter when you do this, and haven't yet pressed the Save Filter button on the Filter Condition Summary screen, the new filter information is lost.
  • Page 142 12-8 12: C HAPTER ONFIGURING Table 12–3 Basic IP Condition Destination Address Source Address Destination Network Source Network Table 12–4 Advanced IP Condition Protocol Type ILTERS Enable or disable the filter. (You may want to create a disabled filter, then enable it when you are satisfied that the filter conditions are complete.) Select the protocol for the filter being added.
  • Page 143 Creating Filters Using the OfficeConnect Remote 840 Manager Destination Port Source Port Destination Port Source Port Generic Byte Origin: IP Header / IP Data Filter Offset ____ (0- 1514 bytes) Length ____ (1-48 bytes) Masked With ___ (0's or F's*) is equal to Basic IPX Condition has the following condition sentences to select from:...
  • Page 144 12-10 12: C HAPTER ONFIGURING Generic Byte Filter *whose length is 2x Length field: two mask numbers for each byte) ** whose length is not greater than 2x Length field. ILTERS Destination Socket Source Socket Destination Port Source Port Origin: IP Header / IP Data Offset ____ (0- 1514 bytes) Length ____ (1-48 bytes) Masked With ___ (0's or F's*)
  • Page 145 Creating Filters Using the OfficeConnect Remote 840 Manager 12-11 Use the Cancel button to cancel any changes since the last time you saved. When you have a filter that contains “And”ed and “Or”ed conditions together, the summary may display extra blank lines between conditions. This is to help you understand exactly what the filter means.

  • Page 146: Step-By-Step Guide To Creating Filters Using The Officeconnect Remote 840 Manager

    12-12 12: C HAPTER ONFIGURING Step-by-Step Guide Filters can be tricky to define so spend time before accessing the screens to Creating Filters thinking about what you want the filter to do. Using the First determine which direction and location of the data path you want to OfficeConnect apply the filter to: for example, do you want to filter packets as they enter Remote 840...

  • Page 147: Modifying An Existing Filter Using The Officeconnect Remote 840 Manager

    Step-by-Step Guide to Creating Filters Using the OfficeConnect Remote 840 Manager 12-13 As before, select the condition sentence, choose the keyword and operation and enter the filter value then press “Next” to see the Condition Summary screen again. 7 When you are satisfied that this filter is complete, press Save Filter on the Condition Summary screen.
  • Page 148 12-14 12: C HAPTER ONFIGURING ILTERS...

  • Page 149: Troubleshooting Tools

    Introduction This chapter contains information on the troubleshooting tools and the troubleshooting areas for your OfficeConnect Remote 840. It is divided into the following sections: Troubleshooting The OfficeConnect Remote 840 has a number of features which can be Tools used to help troubleshoot problems. They are especially useful if the OfficeConnect Remote 840 is not visible during the troubleshooting session.

  • Page 150: Troubleshooting Tables

    13-2 13: T HAPTER ROUBLESHOOTING CLI traces are not accessible through the OfficeConnect Remote 840 Manager. Refer to the OfficeConnect Remote 840 SDSL Router CLI User's Guide for more information. Troubleshooting The troubleshooting tables are organized in a “bottom-up” fashion. The Tables hardware and line problems are listed first, then the higher level router configuration problems are covered.

  • Page 151: Lan Connection Problems

    LAN Connection Problems Symptom The LAN LED is Off. The OfficeConnect Remote 840 Manager Interface status indicates Ethernet interface is down. IP Wizard and Web Browser Problems Symptom The IP Wizard does not find the OfficeConnect Remove 840 on the local LAN.
  • Page 152 13-4 13: T HAPTER ROUBLESHOOTING Symptom Your Web browser does not find the OfficeConnect Remote 840 using its LAN IP address. Possible Causes Corrective Action The workstation does If the workstation is supposed to not have an IP learn its address from the address.
  • Page 153 Symptom Possible Causes The Web browser does There is a problem not find the with the LAN OfficeConnect Remote connection. 840 using its DNS name (DHCP Smart Mode in use). The workstation is on a different IP subnet from the 840’s subnet.

  • Page 154: Wan Connection Problems

    13-6 13: T HAPTER ROUBLESHOOTING WAN Connection Problems Symptom SDSL LED is Off. OfficeConnect Remote 840 Manager Interface Status indicates that interface atm:1/hdlc:1 is down. SDSL LED is Off or goes On briefly then turns Off. OfficeConnect Remote 840 Manager ATM status cell delineation fails and no idle cells are being received.

  • Page 155: General Network Connection Problems

    General Network Connection Symptom Problems Remote network is not responding (e.g. to PINGs or the Web browser connection requests.) General Network Connection Problems Possible Cause Correction Action LAN or WAN 1 See “LAN Connection connection problem. Problems” Connection 2 Go to Monitor > Networks > Network Status to view more detailed problem, then take corrective action.
  • Page 156 13-8 13: T HAPTER ROUBLESHOOTING Symptom Remote network is not responding (e.g. to PINGs or the Web browser connection requests.) The remote network is responding inter- mittently or not at all. Monitor > ATM shows ATM cell delineation successful but Hec sound is high.

  • Page 157: Ip Network Connection Problems

    Symptom Accessing remote information is slower than expected. IP Network Connection Symptom Problems Remote IP network is not responding (ex., to PINGs or the web browser connection requests). IP Network Connection Problems Possible Cause Correction Action The SDSL settings Reset the SDSL link to cause indicate that a slower re-negotiation through one of the baud rate than...
  • Page 158 13-10 13: T HAPTER ROUBLESHOOTING Symptom Possible Cause Corrective Action Some remote sites use Wait 30 seconds and try to access the RIP protocol to remote site again. advertise your IP address to other routers. It may take more than 30 seconds for the IP route to the OfficeConnect Remote 840 to be propagated...
  • Page 159 Symptom Possible Cause My video application Some video applications does not run when using UDP streaming Port Address have two connections, Translation (PAT) is a TCP connection for enabled. control and a UDP stream for data. The TCP connection is initiated from the privately addressed workstation but the...

  • Page 160: Ipx Network Connection Problems

    13-12 13: T HAPTER ROUBLESHOOTING IPX Network Connection Symptom Problems Remote IPX network is not responding (ex., can't find a Novell server). Possible Cause Corrective Action LAN or WAN “LAN Connection connection problem, or “WAN Connection a general configuration “General Network problem.

  • Page 161: Bridge Connection Problems

    Bridge Connection Problems Symptom Remote network is not responding. Bridge Connection Problems 13-13 Possible Cause Corrective Action LAN or WAN “LAN Connection connection problem, or “WAN Connection a general configuration “General Network Connection problem. Problems”. Bridging is not enabled Check the Local Site > Bridge and over both the LAN and Remote Site >...
  • Page 162 13-14 13: T HAPTER ROUBLESHOOTING...

  • Page 163: Bridging And Routing Concepts

    Introduction During the initial configuration of the OfficeConnect Remote 840, you must decide whether to configure the unit as a bridge or as a router. If you are unsure which option you should choose, this section will help you decide. Bridges and routers are used to connect networks together.

  • Page 164: Guidelines For Choosing Bridging Or Routing

    A: B PPENDIX RIDGING AND Guidelines for The list below outlines some of the reasons you might choose to Choosing Bridging or configure the OfficeConnect Remote 840 as a bridge or a router. Read Routing through the rest of this section for more explanation and to help decide which of the above conditions apply to your network.
  • Page 165 How Bridges Learn address table, the bridge knows the destination is on the LAN and therefore discards or filters the frame. If the destination address is not in the address table, the bridge transmits the data across the bridge. It does this even if the destination device is on the local LAN because it does not recognize the destination station as local.
  • Page 166 A: B PPENDIX RIDGING AND OUTING Figure A–1 Simple Remote Bridging The OfficeConnect Remote 840 uses RFC 1483 or PPP encapsulation to connect with other OfficeConnect Remote 840 or third party devices. Building a Larger Large networks of interconnected LANs can be established by using Network multiple bridges as illustrated in Figure A-2.
  • Page 167 How Bridges Learn not be placed on LAN A. Therefore, frames passing between LAN B and LANs C or D will not impact the overall performance of the LAN. Figure A–2 Multiple Remote Bridge Multiple Paths With only a single physical path between LANs, the network is Between Bridge LANs susceptible to link and bridge failures.

  • Page 168: Network Topology

    A: B PPENDIX RIDGING AND other bridges detect this and reconfigure their ports so that there is once again an active data path through the network. Network Topology If your network topology is star shaped, a combination of analog modems and bridging is usually the most efficient and successful option. Routing is a better solution if your network is a complex mix of WAN interconnects and/or multiple protocols.

  • Page 169: The Internet

    Network Organization, Structure, and Physical Layout The Internet The protocol adopted by the Defense Data Network (DDN) for the Internet, is based on obtaining and abiding by, a registered Internet address range. This makes a router the ideal choice for accessing the Internet.

  • Page 170: Open Systems Interconnection Network Layer Model

    A: B PPENDIX RIDGING AND OUTING are able to share the same Class B network address, regardless of their location on the bridged network. Figure A–4 Open Systems Interconnection Network Layer Model Open Systems A routing environment allows stations to communicate indirectly. Interconnection Following the example in under “Routing IP”, let us assume that a station Network Layer Model...

  • Page 171: Ip Routing

    IP Routing Once the packet is received by the Router A, attached to LAN 1, it strips off the network header (refer to Figure above) and examines the Layer 3 header information. It then reviews its routing tables in order to establish where to forward the data packet.
  • Page 172 A-10 A: B PPENDIX RIDGING AND OUTING The algorithm will automatically select to forward the data packet via Router A, as this route contains the least number of hop counts which makes it the preferred direct route. Every thirty seconds (by default), each IP router will advertise, via RIP datagrams, to all other routers on the Internetwork, how many hops it takes to reach all connected logical networks, based on the routers network position and the state of its physical links.

  • Page 173: Introduction To Ip Addressing

    IP A Introduction to IP This section contains a brief introduction to the IP addressing scheme for Addressing administrators that are new to the IP protocol. IP Addressing Basics IP addresses are 32 bits long and generally written in what is called dotted decimal notation: four decimal values separated by periods.

  • Page 174: Reserved Addresses

    B: IP A PPENDIX DDRESSING be host 28 on subnetwork 63 of that network. The network itself would be called 128.5.0.0 (Class B network number 5). Notice that by using subnet masks, you can define a natural hierarchy in which the addresses themselves indicate how a packet is to be routed. However, all routing devices on an IP network must be using the same subnetting scheme.
  • Page 175 IP Addressing Basics Class B network described above, an address of 128.5.255.255 is a broadcast address meaning the packet is destined for all nodes on the entire Class B network. 128.5.63.255 would be a broadcast address indicating that the packet is destined for all nodes on subnet 63 of that Class B network.
  • Page 176 B: IP A PPENDIX DDRESSING can be, but does not have to be, the same as the netmask for any other supernet. As in subnetting, a netmask creates a division between the network portion of an address and the host portion of an address. However, since the network you are defining is larger than a Class C network, the division you are creating is not in the fourth octet of the address.

  • Page 177: Ip Planning

    with OfficeConnect Remote 840. The first option permits you to set the subnet via numerical (8-30 bits) designation. For example: add ip network houston address 192.75.202.99/23 Secondly, you can specify a class designation: A, B, or C. You can also leave the subnet value blank and let the OfficeConnect Remote 840 choose it for you.

  • Page 178: Single Ip Address

    B: IP A PPENDIX DDRESSING To route IP, the two networks to be linked by the OfficeConnect Remote 840 (local LAN and the ISP's or remote site's network) must be on separate IP subnets. For example, all local LAN devices could be on subnet 192.168.1 and all devices in at the remote site could be on subnet 192.168.2.

  • Page 179: Ip Numbered And Unnumbered Links

    2xx.xxx.188.176, and the subnet mask, 255.255.255.248, together to determine the number of addresses we had to work with. First, we convert the last octet (the eight-bit decimal equivalent) of the IP address (176) and the last octet of the subnet mask (248) to binary: The 0s in the subnet mask define our address range, and their three binary positions (23) yield eight addresses.
  • Page 180 B: IP A PPENDIX DDRESSING exists when an IP address identifies the interface as belonging to a specific IP network or subnet (See Figure B-1). Figure B–1 Numbered WAN Interfaces An unnumbered link exists when the IP address 0.0.0.0 is assigned and indicates the interface does not belong to a specific network (see Figure B-2).
  • Page 181 IP Addressing Basics Ethernet interface. This IP address is the source IP address for router-generated packets going out unnumbered interfaces. The router's routing tables and default gateway settings take care of getting the data traffic to the correct remote destinations. Therefore, although you cannot PING or TELNET to the WAN interface when unnumbered is in use, you can PING or TELNET the router using the IP address of a numbered interface.
  • Page 182 B-10 B: IP A PPENDIX DDRESSING...
  • Page 183 Overview Public IP addresses are registered and can be used within a public network, such as the Internet. Due to the limitation of IP version 4 address space and the growth of the Internet, public addresses are becoming more scarce. One solution to this problem is to use private addresses on small LANs and to use Address Translation when accessing devices on the public network.
  • Page 184 C: A PPENDIX DDRESS RANSLATION Network Address With NAT, a pool of public addresses is configured and dynamically Translation (NAT) mapped to a private workstation address when accesses are made through the gateway to a public network. The public-to-private address mapping remains active until the privately-addressed workstation stops accessing the public network.

  • Page 185: Network Address Translation (Nat) C

    Network Address Translation (NAT) provides a firewall and hides the private local network from the outside world. Figure C–1 NAT Example Dynamic NAT When a local PC sends a packet destined for the WAN, the OfficeConnect Remote 840 puts the private source IP address and an IP address from the pool into an address translation table.
  • Page 186 C: A PPENDIX DDRESS RANSLATION Static NAT Static NAT operates like Dynamic NAT except you may add entries to the address translation table and indicate specific IP addresses from the pool to map to specific private LAN IP addresses. This allows controlled access by the outside world.

  • Page 187: Port Address Translation (Pat) C

    Port Address Translation (PAT) Doing this provides a firewall and hides the private local network from the outside world. Figure C–2 PAT Example Dynamic PAT When a local PC sends a packet destined for the WAN, the OfficeConnect Remote 840 puts its source IP address and a port number into an address translation table.
  • Page 188 C: A PPENDIX DDRESS RANSLATION UTORIAL world. You would select the port numbers based on the type of access needed. For example, if you had a local WEB server, you would select the IP address of your server and the port number 80, which is the UDP and TCP port number used to indicate HTML traffic.
  • Page 189 A command line interface will require you to type in individual commands on the screen. You can view and print the OfficeConnect Remote 840 SDSL Router CLI User's Guide (in pdf format) from the CD supplied with your unit, or from the 3Com website http://www.3com.com/support/ocr840/index.html under User Documentation.
  • Page 190 D: U CLI G PPENDIX SING THE UIDE...
  • Page 191 This chapter describes the details for performing the initial configuration of a OfficeConnect Remote 840 when the unit has not been configured or has been restored to factory defaults. This installation method does not use the Setup Wizard. If you want to use Setup Wizard, please refer to the printed Installation Guide that came with your OfficeConnect Remote 840.
  • Page 192 E: C PPENDIX ONFIGURATION ETUP IZARD OF THE FFICE If your unit is using Frame Relay, this will access the Remote Sites General Add screen, containing the following fields: Enter a name to identify the remote site. Enter the Max Packet Size. Set Network Service to PPP over Frame Relay or RFC 1490.

  • Page 193: Instructions For Internet Access E

    If your unit is using ATM, the Remote Sites General Add screen will contain the following fields: Enter a name to identify the remote site. Set Network Service to PPP over Frame Relay or RFC 1483. If PPP, enter the Authentication Name and Authentication Password provided to you.
  • Page 194 E: C PPENDIX ONFIGURATION Step 2: Configuring The ATM Modify screen is to be filled in with information from the the Remote Site ATM Configuration Planning Forms in Chapter 1 of the Installation Guide. Parameters (ATM The screen contains the following fields: Only) 1 Enter the information in these fields as contained in the Configuration Planning Forms.
  • Page 195 1 Configure the Local WAN IP Address: If the ISP provided you with a single IP address, select Specified and enter that address. If you are using PPP to dynamically assign an address, select Dynamic, and the remote site on the WAN will assign a local WAN IP address to you.
  • Page 196 E: C PPENDIX ONFIGURATION 2 Press the Next button to proceed to the IP Advanced Modify screen. This screen contains the following fields: 3 Check the Enable PAT button to use Port Address Translation (refer to the Configuration Planning Table in Chapter 1 of the OfficeConnect Remote 840 SDSL Router Install Guide to determine if PAT is to be enabled).

  • Page 197: Instructions For Telecommuting / Remote Office Access E

    4 Press the Modify button before leaving this screen to save the changes. 5 If you are also going to configure the router for Telecommuting / Remote Office Access, continue to the next section. Otherwise, go to Using the Configuration Audit. Instructions for Before you configure your OfficeConnect Remote 840 to access a remote Telecommuting /...
  • Page 198 E: C PPENDIX ONFIGURATION If your unit is using ATM, the Remote Sites General Add screen will contain the following fields: 2 Click the Add button. This advances you to the ATM Modify screen. ETUP IZARD OF THE FFICE Enter the DLCI. Check the Enable Bridging and/or Enable MAC Encapsulated Routing boxes as needed.
  • Page 199 Step 2: Configuring The ATM Modify screen shown below is to be filled in with information the Remote Site ATM from the Configuration Planning Table you completed in Chapter 1 of the Parameters Installation Guide. 1 Enter the information in these fields as contained in the Configuration Planning Table in Chapter 1 of the OfficeConnect Remote 840 SDSL Router Install Guide.
  • Page 200 E-10 E: C PPENDIX ONFIGURATION Step 3: Configuring 1 If you are routing with IP, complete the entries on this screen. the Remote Site IP Network Information 2 Local WAN IP Address: 3 Remote WAN IP Address: ETUP IZARD OF THE FFICE Otherwise, press Next.
  • Page 201 Instructions for Telecommuting / Remote Office Access If the remote site administrator provided a remote IP address and netmask, select Specified and type in that address and netmask. If the OfficeConnect Remote 840 is learning the remote IP address from the remote site (PPP only), select Learn From Remote. In order to have the remote site you are configuring act as the default gateway, check the Use Remote as Default Gateway checkbox.
  • Page 202 E-12 E: C PPENDIX ONFIGURATION You cannot use an unnumbered Local IP WAN Address and have PAT enabled. 6 If you are routing IPX, press the Next button to proceed to the IPX Step 4: Configuring 1 If you are routing IPX, complete the entries in this page. Otherwise, the Remote Site IPX Network Information 2 Select the option in the IPX WAN Network Address box.

  • Page 203: Step 6: Configuring A Local Bridge Network

    5 5 Press the Save Configuration button on the sidebar to save the settings you just entered. Step 5: Configuring a If you are setting up the OfficeConnect Remote 840 to route IPX, follow Local IPX Network these steps. 1 From the OfficeConnect Remote 840 home page, select Configuration >...

  • Page 204: Saving The Configuration

    E-14 E: C PPENDIX ONFIGURATION Read the explanation of the audit topics and categories to help you interpret the results of the audit by selecting the audit topics at the bottom of the page. Notice that a link is provided at the bottom of each audit topic's configuration page if changes are needed.

  • Page 205: Online Technical Services

    For the very latest, 3Com recommends that you access the 3Com Corporation World Wide Web site. Online Technical 3Com offers worldwide product support 24 hours a day, 7 days a week, Services through the following online systems: World Wide Web Site...

  • Page 206: Support From 3Com

    When you contact 3Com for assistance, have the following information ready: Returning Products Before you send a product directly to 3Com for repair, you must first for Repair obtain a Return Materials Authorization (RMA) number. Products sent to 3Com without RMA numbers will be returned to the sender unopened, at the sender’s expense.

  • Page 207: Bridging Between Remote Sites

    Numbers 3Com URL F - 1 adding a bridge network 5 - 3 a framed IP route to a remote site 4 - 11 a local IP network 4 - 3 a login 2 - 2 a remote site profile 3 - 2...
  • Page 208 concepts A -1 guidelines A -2 IP traffic 5 - 5 multiple paths between LANs A -5 bridging and routing broadcast storms A -6 Internet A -7 IP routing A -9 network topology A -6 network, organization, and physical layout A -6 Open Systems Interconnection Network Layer Model A -8 optimum use of resource A -6 routing IP A -7...
  • Page 209 Default Bridge Mode 5 - 10 for remote site connections 5 - 4 for the LAN 5 - 3 introduction 5 - 1 MAC-Encapsulated Routing 5 - 6 monitoring 5 - 11 testing 5 - 11 configuring bridging for the LAN adding a bridge network 5 - 3 deleting a bridge network 5 - 4 modifying a bridge network 5 - 4...
  • Page 210 ATM site 11 - 7 bridge 11 - 15 connection traffic/error 11 - 7 DHCP 11 - 11 Ethernet interface 11 - 4 Frame Relay VC site 11 - 8 IP, TCP, UDP, ICMP 11 - 10 creating filters overview 12 - 4 using OfficeConnect Remote 840 12 - 4 using the OfficeConnect Remote 840 Manager 12 - 12 Critical Event Log 11 - 16...

  • Page 211: Officeconnect Remote 840 Manager Filter Screens

    enabling bridging for remote site connections 5 - 5 IP routing 4 - 2 Ethernet interface counters 11 - 4 interface status 11 - 3 Ethernet performance 11 - 3 factory defaults, restoring 2 - 3 filtering advertisement filters 12 - 3 capabilities 12 - 2 creating filters 12 - 4 creating filters using OfficeConnect Remote 840 12 - 4...

  • Page 212: Supernetting (Advanced Tcp/Ip)

    counters 11 - 10 network connection problems 13 - 9 networks 11 - 8 numbered and unnumbered links B - 7 planning B - 5 routing A -9 subnet mask address B - 5 tables 11 - 10 testing (PING) 4 - 14 Wizard problems 13 - 3 IP address and subnetting B - 5...
  • Page 213 RIP and SAP 9 - 10 MAC-Encapsulated Routing 1 - 4, 4 - 13, 5 - 6 managing OfficeConnect Remote 840 1 - 14 remote site profile 3 - 2 mapped address table 11 - 11 menus for the OfficeConnect Remote 840 1 - 15 modifying a bridge network 5 - 4 a local IP network 4 - 4...
  • Page 214 Obtaining 10 - 1 obtaining upgraded software 10 - 1 OfficeConnect Remote 840 back panel 1 - 11 CD 10 - 2 creating filters 12 - 12 defined 1 - 2 DIP switches 1 - 12 filter screens 12 - 6 front panel 1 - 10 installing in Default Bridge Mode 5 - 11 managing 1 - 14...
  • Page 215 range of IP addresses B - 6 remote site connection 11 - 7 defined 1 - 5 RIP and SAP 9 - 11 status table 11 - 8 remote site management adding a remote site profile 3 - 2 configuring ATM information 3 - 6 configuring network service information (PPP / RFC 1483/RFC 1490) 3 - 4, 3 - 5 configuring protocol parameters 3 - 8 deleting a remote site profile 3 - 3...

  • Page 216: Table Of Mapped Addresses

    IP, TCP, UDP, ICMP 11 - 10 counters 11 - 10 tables 11 - 10 technical support 3Com URL F - 1 network suppliers F - 1 product repair F - 2 testing bridging 5 - 11 TFTP access 2 - 6...
  • Page 217 tables 11 - 10 Unconfigured Mode, defined 1 - 9 updating software 2 - 4 upgrading software installing 10 - 2 obtaining 10 - 1 OfficeConnect Remote 840 CD 10 - 2 via DOS 10 - 3 via OfficeConnect Remote 840 Manager 10 - 2 URL F - 1 using OfficeConnect Remote 840 1 - 16 connection problems 13 - 6...
  • Page 219 If it appears that any product that is stated to meet this standard does not perform properly with regard to such date data on and after January 1, 2000, and Customer notifies 3Com before the later of April 1, 2000, or ninety (90) days after purchase of the product from 3Com or its authorized reseller, 3Com shall,...
  • Page 220 Please refer to the Technical Support appendix in the User’s Guide for telephone numbers. Response to requests for telephone technical support will be in the form of a return call from a 3Com representative by close of business the following business day.
  • Page 221 This booklet is available from the U.S. Government Printing Office, Washington, D.C. 20402. Stock No. 004-000-00345-4. NOTE: In order to maintain compliance with the limits of a Class B digital device, 3Com requires that you use quality interface cables when connecting to this device. Changes or modifications not expressly approved by 3Com could void the user’s authority to operate this equipment.

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