I am doing static routing to connect computers over three routers.

Here is my scenario: network

Each of the hosts are in /21 subnets. Each of the routers are assigned IP addresses over a /30 subnet. When I go in each of the routers' CLIs, I can ping a host on the VanNuys to a host on Seattle and I can ping a host on Seattle to a host on OK City.

My trouble now is figuring out how a host on Van Nuys can successfully ping one on OK City. Could such a thing be possible using this configuration or would I have to add an additional serial cable that goes directly from OK City to Van Nuys? If so, what would that look like?

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1 Answer 1


Simply add routes to the networks on the other side of the other router. You did that already for some of your routes, but you need to do it for all of the routes.

Static routes don't scale. You should really use a dynamic routing protocol in common with your routers.

You obviously created static routes on your routers in order for a host on the Van Nuys network to be able to ping a host on the Seattle network. Something like:

ip route <destination network address> <destination network mask> <next hop router>

You did this on the Van Nuys router, pointing to the Seattle router, and vice versa. You need to do the same thing for any other networks on the other side of the Seattle router, including the link from the Seattle router to the OK City router, and the network on the other side of the OK City router. From Van Nuys, those networks are on the other side of the Seattle router, which is the next hop router for the networks attached to the Seattle router. You will also need to do the same thing on the OK City router for the networks on the other side of the Seattle router from the perspective of the OK City router.


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