This follows another question i had previously asked.. I am in a situation where sub net A is connected to two routers {Router A{left}} and {routerB{right}}. The sub net A knows that the address of the interface of router A is its default gateway but there is also router B which is also connected to sub net A but from the right.... How do Wwe make sub net A have some kind of secondary default gateway address? Thank You
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2Most often, different gateways lead to different networks. So, you'd set up a specific route to each of these networks. Normally, there's only one default gateway (=fits all) but you can have multiple ones as Ron has explained.– Zac67 ♦May 9, 2021 at 11:55
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1 Answer
The sub net A knows that the address of the interface of router A is its default gateway
Default routes are configured on hosts, not subnets.
It may be helpful to remember that a default route is just like any other route -- it just has the shortest mask.
If you want one route to be the "secondary" route, you first need a mechanism for determining that the primary route is no longer valid. That can be the interface status or information learned from routing protocols.
You also need a methods to indicate the preference of one route over another. there are usually two methods for this: a metric for routes of the same type, and a preference for routes of a different type.
One route is preferred over another, and that's what the host uses to route packets. If the preferred route is no longer preferred, the next best route is used.
answered May 9, 2021 at 11:47
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Thanks for this info, where can i get tutorial on how to make a route prefered over another? May 9, 2021 at 13:19
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A default route and gateway of last resort mean exactly the same thing May 9, 2021 at 17:26
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Route preference depends upon the device OS and the type of routing. May 9, 2021 at 17:29
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how do i make a router that is the default gateway of PC0,contact another router to ping a certain ip address? May 9, 2021 at 17:38