How to Use Multiple Gateways with Windows NT TCP/IPLast reviewed: May 9, 1997Article ID: Q104660 |
The information in this article applies to:
SUMMARYIf the default gateway of a Windows NT computer becomes unavailable, the computer cannot communicate with systems outside its own subnet (aside from those it has established connections with on remote subnets prior to failure). For example, if Router A, the default gateway to Server2, which is on a different subnet, is out of commission when Client1 starts, Client1 is not able to connect to Server2. This is because by default, Windows NT uses only the default gateway specified during setup. So, even though there may be an alternate Router available to connect to Server2, Windows NT will not use it unless it is configured to use multiple default gateways.
MORE INFORMATIONUse the following procedure to configure Windows NT to use multiple gateways by default:
The ROUTE utility can be used to display the currently active default (or smart) gateway; the ROUTE -S PRINT command prints the currently active default gateway, and the ROUTE PRINT command prints all current routes in the routing tables, identifying all default gateways in the table in order of preference. The ROUTE -S ADD command can be used to add additional default gateways after the system has initialized. Any gateways added in this way are appended to the existing list. The ROUTE command does not provide a way to order the gateways, so you must use ROUTE -F to flush all the routing table entries and then add entries in the order of preference. But any changes to the routing tables using the ROUTE utility are not added to the Registry, so to permanently affect the default gateway routing tables, you must add the AdditionalGateways value entry to the Registry. NOTE: The registry value entry only applies to TCP applications. UDP applications cannot use alternate gateways because it is a connectionless datagram.
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