Default Route

To configure the gateway of last resort on a Cisco router, you must configure a default route.

A default route is a route that matches ALL possible destinations.

It is used only if a more specific route match isn't found in the routing table.

The default route is the least specific route possible:

• IP Address: 0.0.0.0

• Mask: 0.0.0.0

To set the default route/gateway of last resort, configure a route to 0.0.0.0/0

The 0.0.0.0/0 range includes 0.0.0.0 ~ 255.255.255.255