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D-Link DSL-2540U User Manual

Adsl/ethernet router with built-in switch
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User Manual
DSL-2540U
ADSL/Ethernet Router with Built-in Switch
July 2012

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Summary of Contents for D-Link DSL-2540U

  • Page 1 User Manual DSL-2540U ADSL/Ethernet Router with Built-in Switch July 2012...
  • Page 2: Table Of Contents

    DSL-2540U ADSL/Ethernet Router with Built-in Switch User Manual Contents Chapter 1. Introduction..........4 Contents and Audience............4 Conventions..............4 Document Structure............4 Chapter 2. Overview..........5 General Information............5 Specifications..............6 Product Appearance............9 Front Panel...............9 Back Panel...............10 Delivery Package............11 Safety Instructions............11 Chapter 3. Installation and Connection......12 Before You Begin............12 Connecting to PC............13...
  • Page 3 DSL-2540U ADSL/Ethernet Router with Built-in Switch User Manual Advanced..............58 UPnP..............58 Interface Grouping............59 DDNS..............61 DNS..............62 Routing..............63 ADSL..............65 Remote Access............66 Firewall..............68 IP Filters...............68 Virtual Servers............71 DMZ..............73 Application Rules............74 MAC Filter...............76 Control..............78 URL Filter...............78 System..............80 Administrator Password...........80 Configuration............81 System Log...............82 Firmware Upgrade............84 NTP Client...............85 Chapter 5.
  • Page 4: Chapter 1. Introduction

    Chapter 2 gives an overview of the router's hardware and software features and describes its appearance and the package contents, and provides safety instructions. Chapter 3 explains how to install the router DSL-2540U and configure a PC in order to access its web-based interface.
  • Page 5: Chapter 2. Overview

    LAN. You can configure and manage the settings of the router DSL-2540U via the user-friendly web- based interface (the interface is available in several languages).
  • Page 6: Specifications

    DSL-2540U ADSL/Ethernet Router with Built-in Switch Overview User Manual Specifications Interfaces: ADSL: 1 RJ-11 port • LAN: 4 RJ-45 10/100BASE-TX Fast Ethernet ports with auto-MDI/MDIX. • ADSL Standards: ADSL: • ◦ full rate ANSI T1.413 Issue 2, ITU-T G.992.1 (G.dmt) Annex A, ITU-T G.992.2 (G.lite) Annex A, ITU-T G.994.1 (G.hs).
  • Page 7 DSL-2540U ADSL/Ethernet Router with Built-in Switch Overview User Manual ATM/PPP Protocols: Bridged and routed Ethernet encapsulation • VC-based or LLC-based multiplexing • ATM Forum UNI3.1/4.0 PVC (up to 8 PVCs) • ATM Adaptation Layer Type 5 (AAL5) • ITU-T I.610 OAM F4/F5 loopback •...
  • Page 8 DSL-2540U ADSL/Ethernet Router with Built-in Switch Overview User Manual QoS: Interface grouping • 3 priority queues. • Configuration and Management: Multilingual web-based interface for configuration and management • Access via TELNET • Firmware update via web-based interface • Saving/restoring configuration to/from file •...
  • Page 9: Product Appearance

    DSL-2540U ADSL/Ethernet Router with Built-in Switch Overview User Manual Product Appearance Front Panel Figure 1. Front panel view. Mode Description The router is powered on. Solid green The router is powered off. Power No light Solid red The router is in the crash recovery mode.
  • Page 10: Back Panel

    DSL-2540U ADSL/Ethernet Router with Built-in Switch Overview User Manual Back Panel Figure 2. Back panel view. Port Description A DSL port to connect the router to the telephone line. 4 Ethernet ports to connect Ethernet devices. One port can be used to connect to a LAN 1-4 private Ethernet line.
  • Page 11: Delivery Package

    DSL-2540U ADSL/Ethernet Router with Built-in Switch Overview User Manual Delivery Package The following should be included: Router DSL-2540U • Power adapter DC 12V/0.5A • RJ-11 telephone cable • Ethernet cable (CAT 5E) • Splitter • “Quick Installation Guide” (brochure). •...
  • Page 12: Chapter 3. Installation And Connection

    Please, read this manual prior to installing the device. Make sure that you have all the necessary information and equipment. Operating System Configuration of the router DSL-2540U (hereinafter referred to as “the router”) is performed via the built-in web-based interface. The web-based interface is available from any operating system that supports a web browser.
  • Page 13: Connecting To Pc

    DSL-2540U ADSL/Ethernet Router with Built-in Switch Installation and Connection User Manual Connecting to PC PC with Ethernet Adapter 1. Make sure that your PC is powered off. 2. Connect an Ethernet cable between any of Ethernet ports located on the back panel of the router and the Ethernet port of your PC.
  • Page 14 DSL-2540U ADSL/Ethernet Router with Built-in Switch Installation and Connection User Manual 3. In the Local Area Connection Properties window, on the General tab, select the Internet Protocol (TCP/IP) line. Click the Properties button. Figure 4. The Local Area Connection Properties window.
  • Page 15 DSL-2540U ADSL/Ethernet Router with Built-in Switch Installation and Connection User Manual 4. Select the Obtain an IP address automatically and Obtain DNS server address automatically radio buttons. Click the OK button. Figure 5. The Internet Protocol (TCP/IP) Properties window. 5. Click the ОК button in the connection properties window.
  • Page 16: Obtaining Ip Address Automatically In Os Windows 7

    DSL-2540U ADSL/Ethernet Router with Built-in Switch Installation and Connection User Manual Obtaining IP Address Automatically in OS Windows 7 1. Click the Start button and proceed to the Control Panel window. 2. Select the Network and Sharing Center section. (If the Control Panel has the category...
  • Page 17 DSL-2540U ADSL/Ethernet Router with Built-in Switch Installation and Connection User Manual 3. In the menu located on the left part of the window, select the Change adapter settings line. Figure 7. The Network and Sharing Center window. Page 17 of 86...
  • Page 18 DSL-2540U ADSL/Ethernet Router with Built-in Switch Installation and Connection User Manual 4. In the opened window, right-click the relevant Local Area Connection icon and select the Properties line in the menu displayed. Figure 8. The Network Connections window. Page 18 of 86...
  • Page 19 DSL-2540U ADSL/Ethernet Router with Built-in Switch Installation and Connection User Manual 5. In the Local Area Connection Properties window, on the Networking tab, select the Internet Protocol Version 4 (TCP/IPv4) line. Click the Properties button. Figure 9. The Local Area Connection Properties window.
  • Page 20 DSL-2540U ADSL/Ethernet Router with Built-in Switch Installation and Connection User Manual 6. Select the Obtain an IP address automatically and Obtain DNS server address automatically radio buttons. Click the OK button. Figure 10. The Internet Protocol Version 4 (TCP/IPv4) Properties window.
  • Page 21: Connecting To Web-Based Interface

    2. In the address bar of the web browser, enter the IP address of the router (by default, the following IP address is specified: 192.168.1.1). Press the Enter key. Figure 11. Connecting to the web-based interface of the DSL-2540U device. 3. On the opened page, enter the username (login) and password for the administrator account (by default, the following username and password are specified: admin, admin).
  • Page 22 To get back to the quick settings page from any Wizard or web-based interface menu section, left- click the D-Link logo in the top left corner of the page. To configure all parameters of the router independently without the Wizards, click the Configure manually button.
  • Page 23 DSL-2540U ADSL/Ethernet Router with Built-in Switch Installation and Connection User Manual From the system statistics page you can proceed to the page for upgrading the router's firmware, contact the technical support group, and proceed to the settings of the local interface.
  • Page 24: Saving And Restoring Settings

    DSL-2540U ADSL/Ethernet Router with Built-in Switch Installation and Connection User Manual Saving and Restoring Settings Note that you should regularly save the changes of the router's settings to the non- volatile memory. The router's web-based interface displays the notification on unsaved changes at the top of the page.
  • Page 25: Chapter 4. Configuring Via Web-Based Interface

    DSL-2540U ADSL/Ethernet Router with Built-in Switch Configuring via Web-based Interface User Manual CHAPTER 4. CONFIGURING WEB-BASED INTERFACE Wizards Internet Setup Wizard To configure connection to the Internet, click the Connect to internet button. Figure 18. Configuring connection to the Internet.
  • Page 26: Pppoe Or Pppoa Connection

    DSL-2540U ADSL/Ethernet Router with Built-in Switch Configuring via Web-based Interface User Manual PPPoE or PPPoA Connection Figure 20. Configuring PPPoE WAN connection. In the Name field, specify a name for the connection for easier identification and click the Next button.
  • Page 27: Service Name

    DSL-2540U ADSL/Ethernet Router with Built-in Switch Configuring via Web-based Interface User Manual If needed, specify additional settings for your PPPoE or PPPoA WAN connection. Figure 22. Configuring PPPoE WAN connection. Parameter Description Displayed for the PPPoE type only. Service name The name of the PPPoE authentication server.
  • Page 28 DSL-2540U ADSL/Ethernet Router with Built-in Switch Configuring via Web-based Interface User Manual Parameter Description Select the checkbox if you want the router to keep you connected to your ISP even when the connection has been inactive for a specified Keep Alive period of time.
  • Page 29 DSL-2540U ADSL/Ethernet Router with Built-in Switch Configuring via Web-based Interface User Manual Parameter Description Select the checkbox to allow multicast traffic from the external Enable IGMP Multicast network (e.g. video streaming) to be received. Select the checkbox if you want one WAN IP address to be used for all computers of your LAN.
  • Page 30: Ipoa Or Static Ip Connection

    DSL-2540U ADSL/Ethernet Router with Built-in Switch Configuring via Web-based Interface User Manual IPoA or Static IP Connection Figure 25. Configuring Static IP WAN connection. In the Name field, specify a name for the connection for easier identification and click the Next button.
  • Page 31 DSL-2540U ADSL/Ethernet Router with Built-in Switch Configuring via Web-based Interface User Manual Click the Next button to continue. If needed, change the connection settings available in the Miscellaneous section. Figure 27. Configuring Static IP WAN connection. Parameter Description Select the checkbox to allow multicast traffic from the external Enable IGMP Multicast network (e.g.
  • Page 32 DSL-2540U ADSL/Ethernet Router with Built-in Switch Configuring via Web-based Interface User Manual Parameter Description Allow to create several Select the checkbox to allow the router to use several untagged connections assigned connections. to this port Select the checkbox to allow the router to use tagged VLAN Use VLAN connections.
  • Page 33: Dynamic Ip Connection

    DSL-2540U ADSL/Ethernet Router with Built-in Switch Configuring via Web-based Interface User Manual Dynamic IP Connection Figure 29. Configuring Dynamic IP WAN connection. In the Name field, specify a name for the connection for easier identification and click the Next button.
  • Page 34 DSL-2540U ADSL/Ethernet Router with Built-in Switch Configuring via Web-based Interface User Manual If needed, change the connection settings available in the Miscellaneous section. Figure 31. Configuring Dynamic IP WAN connection. Parameter Description Select the checkbox to allow multicast traffic from the external Enable IGMP Multicast network (e.g.
  • Page 35 DSL-2540U ADSL/Ethernet Router with Built-in Switch Configuring via Web-based Interface User Manual Parameter Description Allow to create several Select the checkbox to allow the router to use several untagged connections assigned connections. to this port Select the checkbox to allow the router to use tagged VLAN Use VLAN connections.
  • Page 36: Bridge Connection

    DSL-2540U ADSL/Ethernet Router with Built-in Switch Configuring via Web-based Interface User Manual Bridge Connection Figure 33. Configuring Bridge WAN connection. In the Name field, specify a name for the connection for easier identification and click the Next button. Figure 34. Configuring Bridge WAN connection.
  • Page 37 DSL-2540U ADSL/Ethernet Router with Built-in Switch Configuring via Web-based Interface User Manual If needed, change the connection settings available in the VLAN section. Figure 35. Configuring Bridge WAN connection. Parameter Description Allow to create several Select the checkbox to allow the router to use several untagged connections assigned connections.
  • Page 38: Site Setup Wizard

    DSL-2540U ADSL/Ethernet Router with Built-in Switch Configuring via Web-based Interface User Manual Site Setup Wizard To create a virtual server for redirecting incoming Internet traffic to a specified IP address in the LAN, click the Host site button. Figure 36. The page for adding a virtual server.
  • Page 39: Status

    DSL-2540U ADSL/Ethernet Router with Built-in Switch Configuring via Web-based Interface User Manual Status The pages of this section display data on the current state of the router: network statistics • DSL connection status • active WAN connections • IP addresses leased by the DHCP server •...
  • Page 40: Dsl Status

    DSL-2540U ADSL/Ethernet Router with Built-in Switch Configuring via Web-based Interface User Manual DSL Status The information shown on the tabs of the Status / DSL status page can be used for troubleshooting and diagnosing connection problems. Figure 38. The Status / DSL status page.
  • Page 41: Wan Status

    DSL-2540U ADSL/Ethernet Router with Built-in Switch Configuring via Web-based Interface User Manual WAN Status The Status / WAN status page displays active WAN connections. Figure 39. The Status / WAN status page. Page 41 of 86...
  • Page 42: Dhcp

    DSL-2540U ADSL/Ethernet Router with Built-in Switch Configuring via Web-based Interface User Manual DHCP The Status / DHCP page displays the information on computers that have been identified by hostnames and MAC addresses and have got IP addresses from the DHCP server of the device, as well as the IP address expiration periods (the lease time).
  • Page 43: Routing Table

    DSL-2540U ADSL/Ethernet Router with Built-in Switch Configuring via Web-based Interface User Manual Routing Table The Status / Routing table page displays the information on routes. The table contains destination IP addresses, gateways, subnet masks, and other data. Figure 41. The Status / Routing table page.
  • Page 44: Lan Clients

    DSL-2540U ADSL/Ethernet Router with Built-in Switch Configuring via Web-based Interface User Manual LAN Clients On the Status / LAN clients page, you can view data on network devices connected to the router. The page displays devices connected to the built-in switch of the router, and devices accessing the web-based interface of the router.
  • Page 45: Net

    DSL-2540U ADSL/Ethernet Router with Built-in Switch Configuring via Web-based Interface User Manual In this menu you can configure basic parameters of the router's local area network and configure connection to the Internet (a WAN connection). On the Net / WAN page, you can create and edit connections used by the router.
  • Page 46: Creating Adsl Wan Connection

    DSL-2540U ADSL/Ethernet Router with Built-in Switch Configuring via Web-based Interface User Manual Creating ADSL WAN Connection Figure 44. The page for creating a new connection. The General settings, ATM and VLAN sections. Page 46 of 86...
  • Page 47 DSL-2540U ADSL/Ethernet Router with Built-in Switch Configuring via Web-based Interface User Manual Parameter Description General settings A type of network protocol to be used by the connection. Available values: PPPoA • PPPoE • Connection Type Static IP • Dynamic IP •...
  • Page 48 DSL-2540U ADSL/Ethernet Router with Built-in Switch Configuring via Web-based Interface User Manual Parameter Description the Peak Cell Rate field is displayed. Specify a required value (in cells per second). (Constant Bit Rate): This service is used for applications that require a constant data rate. It is mostly used for transferring uncompressed audio and video, e.g.
  • Page 49 DSL-2540U ADSL/Ethernet Router with Built-in Switch Configuring via Web-based Interface User Manual The VLAN section is displayed for the PPPoE, Static IP, Dynamic IP, and Bridge connection types. Parameter Description VLAN Allow to create several Select the checkbox to allow the router to use several untagged connections assigned connections.
  • Page 50 DSL-2540U ADSL/Ethernet Router with Built-in Switch Configuring via Web-based Interface User Manual The PPP section is displayed for the PPPoE and PPPoA connection types. Figure 46. The page for creating a new connection. The PPP section. Parameter Description Username A username (login) to access the Internet.
  • Page 51 DSL-2540U ADSL/Ethernet Router with Built-in Switch Configuring via Web-based Interface User Manual Parameter Description Select the checkbox if you want the router to establish connection to the Internet on demand. In the Maximum idle time field, specify a Dial on demand period of inactivity (in seconds) after which the connection should be terminated.
  • Page 52: Creating Ethernet Wan Connection

    DSL-2540U ADSL/Ethernet Router with Built-in Switch Configuring via Web-based Interface User Manual Creating Ethernet WAN Connection Prior to creating an Ethernet WAN connection, specify a LAN port that will be used as the WAN port (see the Interface Grouping section, page 59).
  • Page 53 DSL-2540U ADSL/Ethernet Router with Built-in Switch Configuring via Web-based Interface User Manual Parameter Description VLAN (The section is displayed, if the VLAN MUX Mode ServiceMUX Mode choice of the Ethernet WAN type radio button is selected on the Advanced / Interface grouping page.)
  • Page 54 DSL-2540U ADSL/Ethernet Router with Built-in Switch Configuring via Web-based Interface User Manual The PPP section is displayed for the PPPoE connection type. Figure 50. The page for creating a new connection. The PPP section. Parameter Description Username A username (login) to access the Internet.
  • Page 55 DSL-2540U ADSL/Ethernet Router with Built-in Switch Configuring via Web-based Interface User Manual Parameter Description Select the checkbox if you want the router to establish connection to the Internet on demand. In the Maximum idle time field, specify a Dial on demand period of inactivity (in seconds) after which the connection should be terminated.
  • Page 56: Lan

    DSL-2540U ADSL/Ethernet Router with Built-in Switch Configuring via Web-based Interface User Manual To configure the router's local interface, proceed to the Net / LAN page. Figure 52. The page for configuring the local interface. If needed, edit the basic parameters of the local interface.
  • Page 57 DSL-2540U ADSL/Ethernet Router with Built-in Switch Configuring via Web-based Interface User Manual In the DHCP server section, you can configure the built-in DHCP sever of the router. Parameter Description An operating mode of the router's DHCP server. Enable: the router assigns IP addresses to clients automatically in accordance with the specified parameters.
  • Page 58: Advanced

    DSL-2540U ADSL/Ethernet Router with Built-in Switch Configuring via Web-based Interface User Manual Advanced In this menu you can configure advanced settings of the router: enable the UPnP function • define interface groups and allow the router to connect to a private Ethernet line •...
  • Page 59: Interface Grouping

    DSL-2540U ADSL/Ethernet Router with Built-in Switch Configuring via Web-based Interface User Manual Interface Grouping On the Advanced / Interface grouping page, you can assign virtual PVC connections to the router's ports (create groups of interfaces), which allows distinguishing different types of traffic.
  • Page 60 DSL-2540U ADSL/Ethernet Router with Built-in Switch Configuring via Web-based Interface User Manual Figure 55. The page for adding a new group of ports. You can specify the following parameters: Parameter Description A name for the group for easier identification. You can specify any Name name.
  • Page 61: Ddns

    DSL-2540U ADSL/Ethernet Router with Built-in Switch Configuring via Web-based Interface User Manual DDNS On the Advanced / DDNS page, you can define parameters of the DDNS service, which allows associating a domain name with dynamic IP addresses. Figure 56. The Advanced / DDNS page.
  • Page 62: Dns

    DSL-2540U ADSL/Ethernet Router with Built-in Switch Configuring via Web-based Interface User Manual On the Advanced / DNS page, you can add DNS servers to the system. Figure 58. The Advanced / DNS page. DNS servers are used to determine the IP address from the name of a server in Intranets or the Internet (as a rule, they are specified by an ISP or assigned by a network administrator).
  • Page 63: Routing

    DSL-2540U ADSL/Ethernet Router with Built-in Switch Configuring via Web-based Interface User Manual Routing On the Advanced / Routing page, you can add static routes (routes for networks that are not connected directly to the device but are available through the interfaces of the device) into the system.
  • Page 64 DSL-2540U ADSL/Ethernet Router with Built-in Switch Configuring via Web-based Interface User Manual You can specify the following parameters: Parameter Description Destination network A destination network to which this route is assigned. Destination netmask The destination network mask. An IP address through which the destination network can be Gateway accessed.
  • Page 65: Adsl

    DSL-2540U ADSL/Ethernet Router with Built-in Switch Configuring via Web-based Interface User Manual ADSL The Advanced / ADSL page includes the set of ADSL standards that should be defined by an ISP. Contact your ISP to set proper parameters. Select the relevant options and click the Change button.
  • Page 66: Remote Access

    DSL-2540U ADSL/Ethernet Router with Built-in Switch Configuring via Web-based Interface User Manual Remote Access On the Advanced / Remote access page, you can configure remote access to the web-based interface of the router. By default, the access from external networks to the router is closed. If you need to allow access to the router from the external network, create relevant rules.
  • Page 67 DSL-2540U ADSL/Ethernet Router with Built-in Switch Configuring via Web-based Interface User Manual Click the Change button. To edit a rule for remote access, click the relevant link. On the opened page, change the needed parameters and click the Change button.
  • Page 68: Firewall

    DSL-2540U ADSL/Ethernet Router with Built-in Switch Configuring via Web-based Interface User Manual Firewall In this menu you can configure the firewall of the router: add rules for IP filtering • create virtual servers • define a DMZ • configure the Port Triggering function •...
  • Page 69 DSL-2540U ADSL/Ethernet Router with Built-in Switch Configuring via Web-based Interface User Manual Figure 65. The page for adding a rule for IP filtering. You can specify the following parameters: Parameter Description IP filter rule editing Name A name for the rule for easier identification.
  • Page 70 DSL-2540U ADSL/Ethernet Router with Built-in Switch Configuring via Web-based Interface User Manual Parameter Description The source host/subnet IP address. If the IP address range checkbox is selected, specify the starting IP address of the range in the Source (first) field and the ending IP address in the Source (last) field.
  • Page 71: Virtual Servers

    DSL-2540U ADSL/Ethernet Router with Built-in Switch Configuring via Web-based Interface User Manual Virtual Servers On the Firewall / Virtual servers page, you can create virtual servers for redirecting incoming Internet traffic to a specified IP address in the local area network.
  • Page 72 DSL-2540U ADSL/Ethernet Router with Built-in Switch Configuring via Web-based Interface User Manual Parameter Description A port of the router from which traffic is directed to the IP address specified in the Private IP field. Specify the start and the end value Public port (begin)/ for the port range.
  • Page 73: Dmz

    DSL-2540U ADSL/Ethernet Router with Built-in Switch Configuring via Web-based Interface User Manual A DMZ is a host or network segment located “between” internal (local) and external (global) networks. In the router, the DMZ implements the capability to transfer a request coming to a port of the DSL router from the external network to a specified host of the internal network.
  • Page 74: Application Rules

    DSL-2540U ADSL/Ethernet Router with Built-in Switch Configuring via Web-based Interface User Manual Application Rules On the Firewall / Application rules page, you can define rules for the Port Triggering function. Figure 69. The Firewall / Application rules page. To add a new rule for the Port Triggering function, click the Add button.
  • Page 75 DSL-2540U ADSL/Ethernet Router with Built-in Switch Configuring via Web-based Interface User Manual You can specify the following parameters: Parameter Description Application rule editing Rules name A name for the rule for easier identification. Interface A WAN connection to which this rule will be assigned.
  • Page 76: Mac Filter

    DSL-2540U ADSL/Ethernet Router with Built-in Switch Configuring via Web-based Interface User Manual MAC Filter The MAC-address-based filtering allows forwarding and blocking traffic subject to the source and destination MAC addresses. MAC-address-based filtering is active only when the device is configured as a transparent bridge (the Bridge mode).
  • Page 77 DSL-2540U ADSL/Ethernet Router with Built-in Switch Configuring via Web-based Interface User Manual On the opened page, specify the needed parameters. Figure 73. The page for adding a rule for MAC-address-based filtering. Parameter Description The MAC address of the source host. To choose a device...
  • Page 78: Control

    DSL-2540U ADSL/Ethernet Router with Built-in Switch Configuring via Web-based Interface User Manual Control This menu is designed to create restrictions on access to certain web sites. URL Filter On the Control / URL filter page, you can specify restrictions on access to certain web sites.
  • Page 79 DSL-2540U ADSL/Ethernet Router with Built-in Switch Configuring via Web-based Interface User Manual Figure 76. The page for adding an address for the URL filter. Enter a URL address in the URL address field, specify a port (as usual, you need to specify port 80 for HTTP), then click the Save button.
  • Page 80: System

    DSL-2540U ADSL/Ethernet Router with Built-in Switch Configuring via Web-based Interface User Manual System In this menu you can do the following: change the password used to access the router's settings • save the current settings to the non-volatile memory •...
  • Page 81: Configuration

    DSL-2540U ADSL/Ethernet Router with Built-in Switch Configuring via Web-based Interface User Manual Configuration On the System / Configuration page, you can save the changed settings to the non-volatile memory, restore the factory defaults, backup the current configuration, or restore the router's configuration from a previously created file.
  • Page 82: System Log

    DSL-2540U ADSL/Ethernet Router with Built-in Switch Configuring via Web-based Interface User Manual System Log On the System / System log page, you can set the system log options and configure sending the system log to a remote host. Figure 79. The System / System log page. The Configuration tab.
  • Page 83 DSL-2540U ADSL/Ethernet Router with Built-in Switch Configuring via Web-based Interface User Manual Control Description The IP or URL address of the host from the local or global network, Server to which the system log will be sent. A port of the host specified in the Server field. By default, the Port value 514 is specified.
  • Page 84: Firmware Upgrade

    DSL-2540U ADSL/Ethernet Router with Built-in Switch Configuring via Web-based Interface User Manual Firmware Upgrade On the System / Firmware upgrade page, you can upgrade the firmware of the router. Figure 81. The System / Firmware upgrade page. The current version of the router's firmware is displayed in the Firmware version field on the Start page.
  • Page 85: Ntp Client

    DSL-2540U ADSL/Ethernet Router with Built-in Switch Configuring via Web-based Interface User Manual NTP Client On the System / NTP client page, you can configure automatic synchronization of the system time with a time server on the Internet. Figure 82. The System / NTP client page.
  • Page 86: Chapter 5. Abbreviations And Acronyms

    DSL-2540U ADSL/Ethernet Router with Built-in Switch Abbreviations and Acronyms User Manual CHAPTER 5. ABBREVIATIONS AND ACRONYMS Address Resolution Protocol DDNS Dynamic Domain Name System DDoS Distributed Denial of Service DHCP Dynamic Host Configuration Protocol DeMilitarized Zone Domain Name System Greenwich Mean Time...