This section describes the Multiple Default Gateways and Dead Gateway Detection features of the Novell TCP/IP stack.
Multiple Default Gateways
This feature extends the existing Default Gateway (Default Router) feature by allowing you to have more than one default gateways to your system. This provides greater robustness in case of any failures. If a default gateway goes offline, the Dead Gateway Detection feature detects this and uses the Multiple Default Gateway list to switch to the next preferred default gateway, thus making your network fault tolerant.
To configure Multiple Default Gateways, load INETCFG and select Protocols | TCPIP. Select the "Static Routing" option and add default route entries.
In a Multiple Default Gateway scenario, first preference is given to the Static Default Gateways, second to RIP, and third to ICMP. If there is more than one Static Default Gateway, then the priority is decided on the basis of the configured metric for the route. RIP has its own algorithm for updating the Default Gateways.
Dead Gateway Detection
This feature is used with the Multiple Default Gateway feature. When the current default gateway goes offline, this feature detects the failure and automatically enables the next preferred default gateway from the Multiple Default Gateway list to act as the current default gateway. When a dead default gateway with a higher preference is again online, this feature detects this and switches back to the default gateway with the higher preference.
To configure and use Dead Gateway Detection, load INETCFG and select Protocols | TCPIP and Timeout. The Probe Interval parameters lets you fine-tune the performance of the Dead Gateway Detection feature by modifying the time interval (in seconds) at which probes are sent to the default gateway to determine whether it is functional. The Probe Timeout parameter sets the time interval (in seconds) after which the next probe is sent to the default gateway when no reply is received by the gateway for the previously sent probe.
Dead Gateway Detection does add overhead to the system, but its benefits offset any resource hit that it may be causing.
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