I inherited a network with a 3640 router. I created a console session to check the router configuration. The serial and Ethernet interfaces are up and up. However when I try to ping the interface I get a destination unreachable (u.u.u) response. I am able to ping out of the network on the WAN side. There is no ACL that prohibits my pinging the interfaces from within the router. What am I overlooking. Thanks for any help
I have this problem too.