Nortel Networks NN46110-602 - Manual (Page 77)

Chapter 4 Troubleshooting 77
Nortel VPN Router Troubleshooting
Action: Validate that the VPN Client is configured with a DNS entry. For
Windows NT 4.0, open a command prompt and enter
ipconfig/all . Verify that
a DNS server entry is listed. For Windows 95, from the Start menu on the task bar,
select Run and enter
winipcfg . Select Nortel VPN Router Extranet Access
Adapter from the list of adapters and click More Info. Record the information
displayed under the DNS Server entry and verify it with the network
administrator.
Cause: The hostname being resolved has both a public and a private IP address,
commonly referred to as a split-horizon DNS.
Action: Open a command prompt and ping the host you are trying to reach with a
fully qualified host name (for example, www.nortel.com). If you receive a
response, verify that the IP address returned on the first line (for example,
www.nortel.com [207.87.31.127]) is an IP address from the remote corporate
network. If it is not, notify your network administrator that you need to modify the
internal hostname so that it is not the same as the external hostname.
Cause: The retail release of Windows 95 contained a bug that prevented use of
more than one DNS server. This problem was fixed in OS Release 2.
Action: If you are using a release earlier than OS Release 2 of Windows 95, a
patch is available from Microsoft to upgrade the winsock.dll. This patch is
downloadable from www.microsoft.com.
Network browsing problems
Cannot browse the network (with NetBEUI)
Cause: For both PPTP and IPsec, the VPN Router does not currently support the
NetBEUI protocol.
Action: To browse resources on a remote domain through a connection to a VPN
Router, it is necessary to remove the NetBEUI protocol and to have a WINS
server configured. By removing NetBEUI, the Microsoft Client uses NetBIOS
over TCP/IP to browse network resources. This applies to both the PPTP dial-up
client provided by Microsoft and the VPN Client provided by Nortel.