Case Study: Default Routes to Interfaces
From time to time, routers are configured with a default route pointing to an interface. In some situations, this is fine, but in others, this can be disastrous. The problems have to do with the link type, ARP, and proxy ARP, which is not well understood.
In Figure 2-15, Router A has a default route configured out interface Ethernet 0:
ip route 0.0.0.0 0.0.0.0 Ethernet 0
Router B has a default route configured out interface serial 0:
ip route 0.0.0.0 0.0.0.0 serial 0
The complaint is that Router A seems to have extremely high processor utilization and is providing sluggish performance at best. Examine the actions of Router B when ws2, which is configured to use Router B as its default gateway, sends a ...
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