Hello all. I am having a routing issue with a cisco 1812. To explain the situation we have x4 cisco 1812's all connected via VPN to another cisco 1812. the central cisco 1812 has two WAN connections too different ISP's. 2 vpn's are connected on 1 WAN interface, and 2 vpn's are connected on the other. All vpns are up. there is a single vlan with a route back to all of our 10.0.0.0/8 numbers which doesn't work. When this route is changed to something more specific on our network such as 10.160.0.0/16 routing works.
So can anyone tell me how to get 10.0.0.0 routing ? or tell me why it isn't routing the entire A class.
Please keep in mind we have 5 of these other routers in other parts of the world routing 10.0.0.0 numbers back out through our MPLS, but this one using dual WAN's on different isp's doesn't seem to want to route the entire 10.0.0.0/8 range.
just for some general info. each of the 4 routers are split up into 4 subnets. 10.199.5.0/26. and the central router is on a 10.199.4.0/24 subnet.
One of the things that can cause the symptoms that you describe is if the router is configured with no ip classless. This used to be the default in IOS (many releases ago) but now the default is ip classless. Can you check and see if the router is configured with ip classless or with no ip classless?
To test it out, I would suggest that you enter the command ip classless in global configuration and see if it helps with your problem.
We will be putting the router back in place tomorrow to do some extra testing so i will get a show IP route then. Our next plan is to route 10.0.0.0/9 and 10.128.0.0/10, which will route everything up to 10.192.0.0. This is working on the theory that the 10.199.0.0 on the local subnet is causing some kind of issue. (maybe cause there is already a route for 10.199.0.0 for the local subnet and 10.0.0.0 over laps it). Not that that should matter, but we are getting thin on ideas.
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