3Com Router WL-537 User Manual
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Advanced85 SecuritySelect Security to display the Security screen. Security Screen The Internet connects millions of computer users throughout the world. The vast majority of th e computer users on the Internet are friendly and have no intention of breaking into, stealing from, or damaging your network. However, there are hack ers who may try to break into your network. The options in the Security tab features help you to protect your network. Advanced Settings The Advanced Sett ings section of the Security screen displays the following options: ■Enable universal plug and pl ay - Universal plug and play allows compatible software to read and change some the Router’s firewall settings. This reduces the configuration required but lessens your control of the Router’s firewall. Check on the check box to enable this feature, and then select Apply.
86CHAPTER 5: ROUTER CONFIGURATION 3Com recommends that you leave this feature disabled for maximum security. ■Allow PING from the Internet - PING is a utility, which is used to determine whether a device is active at the specified IP address. PING is normally used to test the ph ysical connection between two devices, to ensure that everything is working correctly. By default the Router has PING disabled in order to make the device more difficult to find on th e Internet and less prone to attack. Check on the check box to enable this feature, and then select Save. 3Com recommends that you leave this feature disabled for maximum security. ■Disable NAT - Network Address Translation (NAT) is the method by which the Router shares the single IP address assigned by your ISP with the computers on the network. Only disable NAT if your ISP assigns you multiple IP addresses or you need NAT disabled for an advanced system configuration. If you have a single IP address and your turn NAT off, the computers on your network will not be able to access the Internet. Other problems may also occur. Check on the check box to disable NAT, and then select Save. 3Com recommends that you leave this feature enabled for maximum security. Enabling Remote Administration It is possible to administer the Ro uter remotely. Select one of the following options for remote administration: ■Disable Remote Administration - This option is set as default. ■Enable administration from a single Internet Host - Only the specified Host IP Address can manage the Router. Any other users will be rejected. ■Enable administration from a whole subnet - This option allows a number of users within the specified Host Network Address and Subnet Mask to administer the Router. ■Enable administration from any Internet Host - This option allows any host to access the administration pages.
Advanced87 To remotely administer yo ur Router, enter http://xxx.xxx.xxx.xxx:8000 in the location bar of the browser running on the remote computer, where xxx.xxx.xxx.xxx is the Internet IP address of the Router. You may then login using the administration password. Your Internet IP address can be found at the bottom of the screen. . Syslog Select Syslog to display the syslog screen. Check on the check box to enable this feature, and then click Save.
88CHAPTER 5: ROUTER CONFIGURATION Status and LogsSelecting Status and Logs from the main menu displays the Status,! Logs -and Routing Table in yur Web browser window. Status The Status screen displays a tabular repres entation of your network and Internet connection. Status Screen
Status and Logs89 LogsLogs will allow you to view both the normal events, and security threats logged by the Router. Logs Screen Select Incoming Log or Outgoing Log from the Ty p e drop-down menu. The Incoming Log will display a temporary log of the Source IP Addresses and Destination Port Numbers fo rthe in coming Internet trafic. Click the Save Log button to save this information to !a file on your PC's hard drive. Click the Refresh button to update the log. click the Clean button to clear all the information that is displayed. The Outgoing Log will display a temporary log of the LAN IP Addresses, Destination URLs or IP Addresses, Destination URLs or IP Address, and Service or Port Numbers for the outg oing Internet traffic. Click the Save Log button to save this information to a file on your PC's hard drive. Click the Refresh button to update the log. Click the Clearn button to clear all the information that is displayed.
90CHAPTER 5: ROUTER CONFIGURATION Select the Routing table tab to display routing information used by the Router. The information is displayed in the form at shown as below. Selecting Support/Feedback from the main menu displays the Support and Feedback screens. Support Support Screen Selecting the Support option on the main menu displays the support links screen, which contains a list of Inter net links that provide information and support concer ning the Router /Routing Table Support/Feedback
Status and Logs91 FeedbackFeedback Screen Selecting the Feedback option displays the Feedback screen and allows you to provide feedback to 3Com on the operation of your Router . This screen should not be used to obtain technical support.
6 TROUBLESHOOTING Basic Connection Checks■Check that the Router is connected to your co mputers and to the cable/DSL modem, and that all the eq uipment is powered on. Check that the LAN Status and Cable/DSL Status LEDs on the Router are illuminated, and that any corr esponding LEDs on the cable/DSL modem and the NIC are also illuminated. ■Ensure that the computers have completed their start-up procedure and are ready for use. Some network interfaces may not be correctly initialized until the start-up procedure has completed. ■If the link status LED does not illuminate for a port that is connected, check that you do not have a faulty cable. Try a different cable. Browsing to the Router Configuration ScreensIf you have connected your Router and computers together but cannot browse to the Router configuration screens, check the following: ■Confirm that the physical connection between your computer and the Router is OK, and that the LAN Status LEDs on the Router and NIC are illuminated and indicating the same speed (10Mbps or 100Mbps). Some NICs do not have status LEDs, in which case a diagnostic program may be available that can give you this information. ■Ensure that you have configured your computer as described in Chapter 3 ,Setting Up Your Computers . Restart your computer while it is connected to the Router to ensur e that your computer receives an IP address. ■When entering the address of the Rout er into your web browser, ensure that you use the full URL including the http:// prefix (e.g. http://192.168.1.1 ). ■Ensure that you do not have a Web proxy enabled on your computer. Go to the Control Panel and click on Internet Options . Select the
104CHAPTER 6: TROUBLESHOOTING Connections tab and click on the LAN Settings button at the bottom. Make sure that the Proxy Server option is unchecked. ■If you cannot browse to the Router, use the winipcfg utility in Windows 95/98/ME to verify th at your computer has received the correct address information from the Router. From the Start menu, choose Run and then enter winipcfg. Check that the computer has an IP address of the form 192.168.1.xxx (where xxx is in the range 2-254), the subnet mask is 255.255.255.0, and the default Router is 192.168.1.1 (the address of the Router). If these are not correct, use the Release and Renew functions to obtain a new IP address from the Router. Under Windows 2000, use the ipconfig command-line utility to perform the same functions. ■If you still cannot browse to th e Router, then use the Discovery program on the accompanying CD-ROM as described in Appendix A . Connecting to the InternetIf you can browse to the Router configuration screens but cannot access sites on the Internet, check the following: ■Confirm that the physical connection be tween the Router and the cable/DSL modem is OK, and that the link status LEDs on both Router and modem are illuminated. ■Confirm that the connection between the modem and the cable/DSL interface is OK. ■Ensure that you have entered the correct information into the Router configuration screens as required by your Internet Service Provider. Use the “Internet Settings” screen to verify this. ■For DSL users, check that the PPPoE or PPTP user name, password and service name are correct, if these are required. Only enter a PPPoE service name if your ISP requires one. ■For cable users, check whether your ISP requires a fixed MAC (Ethernet) address. If so, use the Clone MAC Address feature in the Router to ensure that the correct MAC address is presented. ■For cable users, check whether your ISP requires a fixed Host Name. If so, enter the required Host Name in the Internet Settings screen. ■Ensure that your computers are not configured to use a Web proxy. On Windows computers, this can be found under Control Panel > Internet Options > Connections .