NETGEAR CG814WG Hardware Manual
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NETGEAR CG814WG Hardware Manual

NETGEAR CG814WG Hardware Manual

Wireless cable modem gateway
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Download this manual See also: Reference Manual, Installation Manual
Hardware Manual for the
Model CG814WG
Wireless Cable Modem
Gateway
NETGEAR, Inc.
4500 Great America Parkway
Santa Clara, CA 95054 USA
Phone 1-888-NETGEAR
SM-CG814WGNA-Comcast-0
October 2003

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Summary of Contents for NETGEAR CG814WG

  • Page 1 Hardware Manual for the Model CG814WG Wireless Cable Modem Gateway NETGEAR, Inc. 4500 Great America Parkway Santa Clara, CA 95054 USA Phone 1-888-NETGEAR SM-CG814WGNA-Comcast-0 October 2003...
  • Page 2 In the interest of improving internal design, operational function, and/or reliability, NETGEAR reserves the right to make changes to the products described in this document without notice. NETGEAR does not assume any liability that may occur due to the use or application of the product(s) or circuit layout(s) described herein.

  • Page 3: Technical Support

    Read instructions for correct handling. Technical Support Thank you for choosing Comcast as your Internet Service Provider and Netgear product(s). Please register online and take advantage of the technical support resources such as Netgear online knowledge base. Technical support is available...

  • Page 5: Table Of Contents

    Audience ... ix Typographical Conventions ... ix Special Message Formats ... x Chapter 1 Hardware Overview...1-1 About the CG814WG ...1-1 Built-in Cable Modem ...1-1 A Powerful, True Firewall ...1-1 802.11g Standards-based Wireless Networking ...1-2 Configurable Auto Uplink™ Ethernet Connection ...1-2 USB Port ...1-3...
  • Page 6 Two Basic Operating Modes ... C-2 CG814WG Default Wireless Configuration Settings ... C-3 Basic Installation Instructions ... C-4 For Windows XP Users Installing a CG814WG ... C-4 Wireless Connection Indicators ... C-8 Interpreting the LED on the CG814WG ... C-8 Interpreting System Tray Icon Colors ...
  • Page 7 Basic Router Concepts ... D-1 What is a Router? ... D-2 Routing Information Protocol ... D-2 IP Addresses and the Internet ... D-2 Netmask ... D-4 Subnet Addressing ... D-5 Single IP Address Operation Using NAT ... D-7 MAC Addresses and Address Resolution Protocol ... D-8 Related Documents ...
  • Page 8 viii Contents...

  • Page 9: About This Manual

    Thank your for purchasing the NETGEAR This manual describes the features of the gateway and provides installation and configuration instructions. Audience This reference manual assumes that the reader has basic to intermediate computer and Internet skills. However, basic computer network, Internet, firewall, and PC networking technologies tutorial information is provided in the Appendices.

  • Page 10: Special Message Formats

    Special Message Formats This guide uses the following formats to highlight special messages: Note: This format is used to highlight information of importance or special interest. Warning: This format is used to highlight information about the possibility of injury or equipment damage.

  • Page 11: Chapter 1 Hardware Overview

    A Powerful, True Firewall Unlike simple Internet sharing NAT routers, the CG814WG is a true firewall, using stateful packet inspection to defend against hacker attacks. Its firewall features include:...

  • Page 12: 802.11G Standards-Based Wireless Networking

    Wireless access can be restricted by MAC address. Configurable Auto Uplink™ Ethernet Connection With its internal 4-port 10/100 switch, the CG814WG can connect to either a 10 Mbps standard Ethernet network or a 100 Mbps Fast Ethernet network. Both the local LAN and the Internet WAN interfaces are autosensing and capable of full-duplex or half-duplex operation.

  • Page 13: Usb Port

    • IP Address Sharing by NAT The CG814WG allows several networked PCs to share an Internet account using only a single IP address, which may be statically or dynamically assigned by your Internet service provider (ISP). This technique, known as Network Address Translation (NAT), allows the use of an inexpensive single-user ISP account.
  • Page 14 • Visual monitoring The gateway’s front panel LEDs provide an easy way to monitor its status and activity. Hardware Overview...

  • Page 15: What's In The Box

    — Application Notes, Tools, and other helpful information If any of the parts are incorrect, missing, or damaged, contact your NETGEAR dealer. Keep the carton, including the original packing materials, in case you need to return the product for repair.
  • Page 16 Table 1-1. LED Descriptions Test Cable Link On (Green) Cable Downstream Traffic Cable Upstream Traffic Wireless Blink Local On (Green) (Local Area Blink (Green) Network) On (Yellow) Blink (Yellow) On (Green) Blink (Green) A system failure has occurred. Reboot the gateway. Normal operation.

  • Page 17: The Gateway's Rear Panel

    The Gateway’s Rear Panel The rear panel of the CG814WG Viewed from left to right, the rear panel contains the following elements: • 802.11g Wireless anteenna • AC power adapter input • Factory Default Reset push button • USB port for connecting the gateway to a local computer •...
  • Page 18 Hardware Manual for the Model CG814WG Wireless Cable Modem Gateway Hardware Overview...

  • Page 19: Preparing Your Network

    DHCP server during bootup. For a detailed explanation of the meaning and purpose of these configuration items, refer to The CG814WG Gateway is shipped preconfigured as a DHCP server. The gateway assigns the following TCP/IP configuration information automatically when the PCs are rebooted: •...

  • Page 20: Configuring Windows 98 Se And Me For Tcp/Ip Networking

    • Subnet mask—255.255.255.0 • Gateway address (the gateway)—192.168.0.1 These addresses are part of the IETF-designated private address range for use in private networks. Configuring Windows 98 SE and Me for TCP/IP Networking As part of the PC preparation process, you need to manually install and configure TCP/IP on each networked PC.
  • Page 21 You must have an Ethernet adapter, the TCP/IP protocol, and Client for Microsoft Networks. Note: It is not necessary to remove any other network components shown in the Network window in order to install the adapter, TCP/IP, or Client for Microsoft Networks.

  • Page 22: Enabling Dhcp

    If you need Client for Microsoft Networks: Click the Add button. Select Client, and then click Add. Select Microsoft. Select Client for Microsoft Networks, and then click OK. Restart your PC for the changes to take effect. Enabling DHCP After the TCP/IP protocol components are installed, each PC must be assigned specific information about itself and resources that are available on its network.
  • Page 23 Verify the following settings as shown: • Client for Microsoft Network exists • Ethernet adapter is present • TCP/IP is present • Primary Network Logon is set to Windows logon Click on the Properties button. The following TCP/IP Properties window will display.

  • Page 24: Selecting Windows' Internet Access Method

    By default, the IP Address tab is open on this window. Verify the following: • Obtain an IP address automatically is selected. If not selected, click in the radio button to the left of it to select it. This setting is required to enable the DHCP server to automatically assign an IP address.

  • Page 25: Configuring Windows 2000 Or Xp For Tcp/Ip Networking

    From the drop-down box, select your Ethernet adapter. The window is updated to show your settings, which should match the values below if you are using the default TCP/IP settings that NETGEAR recommends for connecting through a router or gateway: •...

  • Page 26: Dhcp Configuration Of Tcp/Ip In Windows Xp Or 2000

    DHCP Configuration of TCP/IP in Windows XP or 2000 You will find there are many similarities in the procedures for different Windows systems when using DHCP to configure TCP/IP. The following steps will walk you through the configuration process for each of these versions of Windows.
  • Page 27 Now the Network Connection window displays. The Connections List that shows all the network connections set up on the PC, located to the right of the window. • Right-click on the Connection with the wireless icon and choose Status. Now you should be at the Local Area Network Connection Status window.
  • Page 28 The TCP/IP details are presented on the Support tab page. • Select Internet Protocol, and click Properties to view the configuration information. 2-10 Preparing Your Network...

  • Page 29: Dhcp Configuration Of Tcp/Ip In Windows 2000

    Verify that the Obtain an IP address automatically radio button is selected. • Verify that Obtain DNS server address automatically radio button is selected. • Click the OK button. This completes the DHCP configuration of TCP/IP in Windows XP. Repeat these steps for each PC with this version of Windows on your network.
  • Page 30 • Click on the My Network Places icon on the Windows desktop. This will bring up a window called Network and Dial-up Connections. • Right click on Local Area Connection and select Properties. The Local Area Connection Properties dialog box appears. •...
  • Page 31 • With Internet Protocol (TCP/IP) selected, click on Properties to open the Internet Protocol (TCP/IP) Properties dialogue box. Verify that – Obtain an IP address automatically is selected. – Obtain DNS server address automatically is selected. • Click OK to return to Local Area Connection Properties.

  • Page 32: Verifying Tcp/Ip Properties For Windows Xp And 2000

    Type ipconfig /all Your IP Configuration information will be listed, and should match the values below if you are using the default TCP/IP settings that NETGEAR recommends for connecting through a router or gateway: • The IP address is between 192.168.0.2 and 192.168.0.254 •...

  • Page 33: Verifying The Readiness Of Your Internet Account

    Hardware Manual for the Model CG814WG Wireless Cable Modem Gateway Verifying the Readiness of Your Internet Account For broadband access to the Internet, you need to contract with an Internet service provider (ISP) for a single-user Internet access account using a cable modem or DSL modem. This modem must be a separate physical box (not a card) and must provide an Ethernet port intended for connection to a Network Interface Card (NIC) in a computer.

  • Page 34: Obtaining Isp Configuration Information From Your Computer

    As mentioned above, you may need to collect configuration information from your PC so that you can use this information when you configure the CG814WG Gateway. Following this procedure is only necessary when your ISP does not dynamically supply the account information.

  • Page 35: Restarting The Network

    Restart any computer that is connected to the firewall. After configuring all of your computers for TCP/IP networking and restarting them, and connecting them to the local network of your CG814WG Gateway, you are ready to access and configure the gateway.
  • Page 36 Hardware Manual for the Model CG814WG Wireless Cable Modem Gateway 2-18 Preparing Your Network...

  • Page 37: Appendix A Troubleshooting

    This chapter gives information about troubleshooting your CG814WG Wireless Cable Modem Gateway. For the common problems listed, go to the section indicated. • Is the gateway on? • Have I connected the gateway correctly? Go to “Basic Functions” on page •...

  • Page 38: Power Led Not On

    • Check that you are using the 12VDC power adapter supplied by NETGEAR for this product. If the error persists, you have a hardware problem and should contact technical support.

  • Page 39: Cable Link Led Not On

    Cable Link LED Not On If the Cable Link LED does not light when connected to your cable television cable, check the following: • Make sure that the coaxial cable connections are secure at the gateway and at the wall jack. •...

  • Page 40: Testing The Path From Your Pc To A Remote Device

    ping 192.168.0.1 Click on OK. You should see a message like this one: Pinging <IP address> with 32 bytes of data If the path is working, you see this message: Reply from < IP address >: bytes=32 time=NN ms TTL=xxx If the path is not working, you see this message: Request timed out If the path is not functioning correctly, you could have one of the following problems:...

  • Page 41: Erasing The Current/Restoring The Factory Configuration

    CG814W Gateway” on page Erasing the Current/Restoring the Factory Configuration The configuration settings of the CG814WG Gateway are stored in a configuration file in the gateway. This file can be reverted to factory default settings. The procedures below explain how to do these tasks.
  • Page 42 Hardware Manual for the Model CG814WG Wireless Cable Modem Gateway Troubleshooting...

  • Page 43: Appendix B Glossary

    Domain names are of the form of a registered entity name plus one of a number of predefined top level suffixes such as .com, .edu, .uk, etc. For example, in the address mail.NETGEAR.com, mail is a server name and NETGEAR.com is the domain.
  • Page 44 IETF Internet Engineering Task Force. An open international community of network designers, operators, vendors, and researchers concerned with the evolution of the Internet architecture and the smooth operation of the Internet. Working groups of the IETF propose standard protocols and procedures for the Internet, which are published as RFCs (Request for Comment) at www.ietf.org.
  • Page 45 packet A block of information sent over a network. A packet typically contains a source and destination network address, some protocol and length information, a block of data, and a checksum. See Point-to-Point Protocol. Point-to-Point PPP. A protocol allowing a computer using TCP/IP to connect directly to the Protocol Internet.
  • Page 46 Hardware Manual for the Model CG814WG Wireless Cable Modem Gateway Glossary...

  • Page 47: Appendix C Configuring Wireless Security In Windows Xp

    Observe Location and Range Guidelines Computers can connect over 802.11 wireless networks indoors at a range which vary significantly based on the physical location of the computer with the CG814WG Wireless Cable Modem Gateway. For best results, avoid potential sources of interference, such as: •...

  • Page 48: Two Basic Operating Modes

    Two Basic Operating Modes The CG814WG Gateway, like all 802.11 adapters, can operate in the following two basic modes: • : An 802.11 networking framework in which devices and computers Infrastructure Mode communicate with each other by first going through an access point (AP). For example, this mode is used when computers in a house connect to an Access Point that is attached to a router which lets multiple computers share a single Cable or DSL broadband Internet connection.

  • Page 49: Cg814Wg Default Wireless Configuration Settings

    Your CG814WG Wireless Cable Modem Gateway factory default basic settings are: • Network Name Service Set Identification (SSID): : In order for the CG814WG Gateway to communicate with a wireless access point or Note wireless adapter, all devices must be configured with the same wireless network name (SSID).

  • Page 50: Basic Installation Instructions

    Basic Installation Instructions Use the procedure below that corresponds to the version of Windows you are using. For Windows XP Users Installing a CG814WG Install the CG814WG driver and configuration utility software. Power on your notebook, let the operating system boot up completely, and log in as needed.
  • Page 51 Windows XP Logo testing message. After the installation completes, click Finish to close the wizard. You should see the CG814WG system tray icon on the right in the lower right portion of the Windows task bar. Windows XP will display a Wireless Network Connection message.
  • Page 52 Note: This procedure assumes your wireless network is not using WEP security. If your wireless network uses WEP, set up your CG814WG accordingly. To view WEP settings help, click the Advanced button and click the “Learn about...” link on the Windows XP Local Area Connection Wireless Networks Properties tab page.
  • Page 53 Verify wireless connectivity to your network. Open the CG814WG utility by clicking on the icon Verify that your Connection and Status Monitor information matches your wireless network. Check the two CG814WG LEDs: • Solid green for the LINK LED indicates a good connection. Blinking for the LINK LED indicates attempting to connect.

  • Page 54: Wireless Connection Indicators

    Wireless Connection Indicators The NETGEAR wireless adapters provide the indicators which give you feedback on the status of your wireless connection: • LEDs on the wireless adapter indicate the condition of wireless link. • The color of the SysTray icon is on the System Tray portion of the taskbar in the Microsoft Windows desktop indicates the status of the connection.

  • Page 55: Interpreting System Tray Icon Colors

    Interpreting System Tray Icon Colors The System Tray (SysTray) resides on one end of the taskbar in the Microsoft Windows desktop. Color Condition The wireless PC Card has no connection to any other wireless node. Yellow The wireless PC Card has a connection with another wireless node.

  • Page 56: Basic Troubleshooting Tips

    Basic Troubleshooting Tips If you have problems connected to your wireless network, try the tips below. Symptom Cause The PC Card The wireless LINK LED is adapter is not not lit. inserted into the slot properly or its software is not loaded.

  • Page 57: Networks, Routing, And Firewall Basics

    Hardware Manual for the Model CG814WG Wireless Cable Modem Gateway Appendix D Networks, Routing, and Firewall Basics This chapter provides an overview of IP networks, routing, and firewalls. Related Publications As you read this document, you may be directed to various RFC documents for further information.

  • Page 58: What Is A Router

    Information Protocol (RIP). Using RIP, routers periodically update one another and check for changes to add to the routing table. The CG814WG Gateway supports both the older RIP-1 and the newer RIP-2 protocols. Among other improvements, RIP-2 supports subnet and multicast protocols. RIP is not required for most home applications.
  • Page 59 The latter version is easier to remember and easier to enter into your computer. In addition, the 32 bits of the address are subdivided into two parts. The first part of the address identifies the network, and the second part identifies the host node or station on the network. The dividing point may vary depending on the address range and the application.

  • Page 60: Netmask

    • Class C Class C addresses can have 254 hosts on a network. Class C addresses use 24 bits for the network address and eight bits for the node. They are in this range: 192.0.1.x to 223.255.254.x. • Class D Class D addresses are used for multicasts (messages sent to many hosts).

  • Page 61: Subnet Addressing

    Hardware Manual for the Model CG814WG Wireless Cable Modem Gateway As a shorter alternative to dotted-decimal notation, the netmask may also be expressed in terms of the number of ones from the left. This number is appended to the IP address, following a backward slash (/), as “/n.”...
  • Page 62 Although the preceding example uses the entire third octet for a subnet address, note that you are not restricted to octet boundaries in subnetting. To create more network numbers, you need only shift some bits from the host address to the network address. For instance, to partition a Class C network number (192.68.135.0) into two, you shift one bit from the host address to the network address.

  • Page 63: Single Ip Address Operation Using Nat

    255.255.255.248 255.255.255.252 255.255.255.254 255.255.255.255 NETGEAR strongly recommends that you configure all hosts on a LAN segment to use the same netmask for the following reasons: • So that hosts recognize local IP broadcast packets When a device broadcasts to its segment neighbors, it uses a destination address of the local network address with all ones for the host address.

  • Page 64: Mac Addresses And Address Resolution Protocol

    192.168.0.2 192.168.0.3 192.168.0.1 192.168.0.4 192.168.0.5 Figure D-3: Single IP Address Operation Using NAT This scheme offers the additional benefit of firewall-like protection because the internal LAN addresses are not available to the Internet through the translated connection. All incoming inquiries are filtered out by the router. This filtering can prevent intruders from probing your system.

  • Page 65: Related Documents

    Many of the resources on the Internet can be addressed by simple descriptive names such as www.NETGEAR.com. This addressing is very helpful at the application level, but the descriptive name must be translated to an IP address in order for a user to actually contact the resource. Just as...

  • Page 66: Ip Configuration By Dhcp

    IP addresses, along with other information (such as gateway and DNS addresses) that it may assign to the other devices on the network. The CG814WG Gateway has the capacity to act as a DHCP server.

  • Page 67: Stateful Packet Inspection

    Stateful Packet Inspection Unlike simple Internet sharing routers, a firewall uses a process called stateful packet inspection to ensure secure firewall filtering to protect your network from attacks and intrusions. Since user-level applications such as FTP and Web browsers can create complex patterns of network traffic, it is necessary for the firewall to analyze groups of network connection “states.”...

  • Page 68: Cable Quality

    Hardware Manual for the Model CG814WG Wireless Cable Modem Gateway transmit pair must be exchanged with the receive pair. This exchange is done by one of two mechanisms. Most hubs provide an Uplink switch which will exchange the pairs on one port, allowing that port to be connected to another hub using a normal Ethernet cable.

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