Currently I'm using 2x3845 routers with 4x 16 port SSC cards. Each serial interface is set-up with an IP address and a peer IP address. (Please see attach configuration).
I log into the router using a Linux laptop. I'm unable to ping the serial IP address, however I can ping the peer IP address. Each serial interface is set with PPP enable. My question why can I ping the serial interface IP address?