Reference Guide for the Model RH340 Internet Access ISDN Router
6-8
Troubleshooting
Examine the trace steps beginning with the second outgoing call. Common causes of Multilink
problems are:
•
Your ISP may not support Multilink connections.
Confirm that your ISP supports Multilink connections and that the phone numbers your router
is dialing reach a Multilink-enabled ISP site.
•
The second call may be dialing a different location.
In your ISP configuration, enter the same phone number as both Primary Number and
Secondary Number.
•
If you have enabled BACP, there may be an incompatibility with the ISP router’s BACP.
Turn off BACP.
In the preceding test, the second channel is added immediately after the first channel successfully
connects. If your router is configured for bandwidth on demand (in which the second channel is
added only when there is heavy data traffic), you may still experience Multilink failures. The most
common reason is that the two calls placed by your router may not both reach the same ISP router.
If your ISP maintains more than one router at the dial-up location, it is possible that your two calls
may reach two different routers at the same dial-up number. In this case, your ISP may not be able
to join the two calls.
Troubleshooting Internet Applications
Well-known incompatibilities exist between NAT and certain Internet applications such as online
games and videoconferencing programs. In general, problems occur in the following instances:
•
When an application embeds IP address and port number information in the data portion of the
packets
Or
•
When an application uses the connectionless UDP protocol for speed when the
connection-oriented TCP protocol is more appropriate
