I have the following scenario:
- I am using two Cisco 1941 routers
- Network A connected to Router1 (192.168.10.0/24) (Gigabit connection)
- Network C connected to Router 2 (192.168.20.0/24) (Gigabit connection)
- Network B connecting Router1 and Router2 (192.168.30.0/30) (Serial connection)
- No entries have been added to the routing table (other than what is automatically added for directly connected networks)
- There is no gateway of last resort set up.
- I can ping from Network A to both interfaces on Router 1 (192.168.10.1, 192.168.30.1)
- Even though Network B has been automatically added to the routing table on Router 1 as a directly connected network, I cannot ping Router2's interface (192.168.30.2) on Network B from Network A.
- The only way I can get this to work is by adding the gateway of last resort to Router1.
Since Network B is a directly connected route on Router 1, why can I only ping (from Network A) Router1's interface on Network B, but I cannot ping Router2's interface on Network B?