Simulation

Pre-requisites: Ping, default route.

A gateway of last resort is used to forward packets whose destination address is not listed in the routing table. It is useful in networks where learning where the rest of the networks exist is not necessary. Whenever a packet hits the router’s interface and if the destination layer 3 information is not available in the routing table the packet is forwarded to the gateway of last resort. We can provide a gateway of last resort to a router using the command:

ip route 0.0.0.0 0.0.0.0 <next hop ip address>