I have configured a serial port on my 3640 router with ppp encapsulation, and the remote port on a 1605 with ppp encapsulation. I can telnet into the remote port but I cannot ping it, neither can I ping the local serial port. Please help.
Probably you can telnet to the router interfaces you configured for PPP. you may have to configure a static route pointing to the network addresses configured into the ethernet addresses of the rotuers. like: ip route 10.1.1.0 255.255.255.0 X.X.X.X (where X is the address of the PPP interfaces). Than you can ping the ethernet interface.
After that - if you are running a routing protocol you may configure in both routers and use access-list to control the routing updates so you connect only when you have traffic. Also check the possibilities of use a diale interface. In this case you use the loopback interface.
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