Operation Manual

Problems with TCP/IP
NT/MPRI – 6 Tips and Troubleshooting 84
required. In order to eliminate conflicts and potential error sources, it
is advisable to remove all network protocols from the second network
adapter.
6.3 Problems with TCP/IP
Configuration instructions for connecting two Windows NT networks
using TCP/IP over ISDN, and for connections to the Internet, can be
found in the section “Configuration and Operation of the NT/MPRI: The
Basics” from page 31.
Should routing problems arise with TCP/IP, first try to ping the server at
the ADC. Then ping the IP address of your own NT/MPRI. If necessary,
use the “-w” option to wait longer for a response from the remote host.
In any case, make sure that the IP address configured for the NT/MPRI
is the one assigned by the Internet provider. Otherwise reply packets
cannot be routed to your network.
Use the NT/MPRI’s packet trace function to test whether the ping re-
quest actually goes out over the ISDN line. If so, and yet no answer is
received, check the remote router’s routing information.
Windows XP/2000/NT or Windows 98/95 workstations in the LAN can-
not access a remote server.
Use WINS for NetBIOS name resolution.
To do so, install a WINS server in each LAN. At each site, enter the re-
mote LAN’s WINS server for replication and set the replication interval
to a high value. This saves ISDN costs. Finally, enter the local WINS
server in each workstation’s network settings.
No IP connection to a remote system.
l Check whether several default routes inadvertently have been
bound to different call destinations and activated.
l Check in the Control Panel whether the IP protocol settings are
correct and that they have been implemented in the NT/MPRI con-
figuration. Check the IP settings currently valid in the NT/MPRI
Manager at: “Special / Support Information / Compile Data / Con-
figuration / Special / LAN Interfaces (internal)”.
If the data listed there are not those expected, check the TCP/IP
settings in the Control Panel again, this time at:
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