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Chapter 9
Troubleshooting

This Chapter explains the most common problems, and the solution to them.

Overview

This section covers some common problems that may be encountered while using the ISDN Internet Router. If you follow the suggested steps and the ISDN Internet Router still does not function properly, contact your dealer for further advice.

Internet Access

Problem 1
ISDN Internet Router is not listed in the Windows utility.
Solution 1
Check the following:
  • The ISDN Internet Router is properly installed, LAN connections are OK, and it is powered ON.
  • Ensure that your PC and the ISDN Internet Router are on the same network segment. (If you don't have a router, this must be the case.)
Problem 2
When I enter an URL or IP address I get a time out error.
Solution 2
Try the following troubleshooting steps.
  1. If using static IP Addresses, ensure that your workstations IP settings are correct, including IP address, default gateway and DNS.
  2. Ping the ISDN Internet Router. Use the "Run" command to enter the following command:
    Ping xxx.xxx.xxx.xxx
    where xxx.xxx.xxx.xxx is the ISDN Internet Router's IP address.
  3. If the ping command fails, check that the ISDN Internet Router is connected and ON. If it is connected and on, there is a problem with your LAN.
  4. On the Quick Setup screen, check that Enable Internet Access is checked.
  5. Check the ISDN Status screen, and examine the Connection Log. For details of the Log messages, refer to page 2.
  6. Check your "Proxy Server" settings on your PCs.
    • The ISDN Internet Router is NOT a Proxy Server; PCs do not require "Proxy Server" settings to use it.
    • If you have Proxy Server on your local LAN, you should turn it Off, and disable the "Proxy Server" settings in your PC applications.
    • If your ISP has a Proxy Server, follow the instructions provided by the ISP.
Problem 3
Some applications do not run properly when using the ISDN Internet Router.
Solution 3
The ISDN Internet Router processes the data passing through it, so it is not transparent.
The following applications and protocols are transparently supported:
Telnet, FTP, HTTP, ping
POP/SMTP, Archie, NNTP
TFTP, IRC, Gopher
DNS, SNMP, Real Audio
For applications which are not transparently supported, 2 features can be used:
  • Special Applications
    (Internet Application tab). If possible, you should use this feature. You can add additional applications to those already listed, using the data provided by the service provider.
    Note: At any time, only 1 PC can use a particular Special Application.
  • Exposed Computer
    (Internet Application tab). If an Internet Application cannot be made to work using the Special Application feature, you can use this method. However, this is a security risk, so should only be used when essential.

Dial-in

Problem 1
My modem can't establish a connection to the ISDN Internet Router.
Solution 1
You can NOT use a modem. You must use an ISDN TA, and establish an ISDN link.
Problem 2
I always get a busy tone when I try to dial-in.
Solution 2
Check the Usage setting on the ISDN tab. If set to "Always use 2 B channels", then dial-in is only possible when the ISDN Internet Router is idle.
If set to "Dynamically use 2 B Channels", then dial-in access will be provided by dropping 1 B channel if necessary.
Problem 3
When using Dial-in, I get an IP Address conflict involving the dial-in PC.
Solution 3
This can happen if you are not using the DHCP Server feature of the ISDN Internet Router.
The ISDN Internet Router must allocate an IP Address to the dial-in PC, even if the DHCP Server is disabled. It allocates the IP Address shown in the Start IP Address field for the DHCP Server (on the LAN tab of the Manager utility).
If this causes an IP Address conflict, you can change this value as follows:
  1. On the LAN tab, enable the DHCP Server function.
  2. Select an unused IP Address from the address range used on your PC, and enter in the Start IP Address field.
  3. Disable the DHCP Server function.
  4. Click OK to save.




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