Task 8.2 Spoof Prevention

Hello Experts,

The question asks: Configure R1 and R6 to drop any traffic recieved from AS54 for which they do not have a route that points out the incoming interface.

In my understanding is that my following solution is correct:

interface Serial0/0
  ip verify unicast source reachable-via rx

In the Solution guide, the following command is used:

ip verify unicast reverse-path

Any explanation? Is my solution correct? If not please help by adding some clarification.

Thanks in advance,



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