I'd like to use an 1812 to route data between 2 subnets (say 10.1.1.x and 11.1.1.x). I'm setting up the two WAN interfaces (FastEthernet0 and FastEthernet1) with IP addresses and subnet masks for each of the two subnets.
Will traffic heading from the 10.1.1.x subnet and destined for the 11.1.1.x subnet automatically route correctly (and vice-versa), or will I need to configure static routing?
Also, a follow-up question. If I'm only expecting traffic from one of the subnets and destined to the other (either 10.1.1.x to 11.1.1.x, or vice-versa), do I need to configure a default route? If no default route is configured, what happens if a packet comes in destined for an unknown subnet?