How to enable anti-spoofing on Cisco Router

Unicast Reverse Path Forwarding (Unicast RPF) to help in limit the malicious traffic on an enterprise network. This security feature will work by enabling a router to verify the reachability of the source address in packets being forwarded.This capability can limit the appearance of spoofed addresses on a network. If the source IP address is not valid, the packet is discarded

interface FastEthernet 0/0
ip verify unicast source reachable-via {rx | any} [allow-default] [allow-self-ping] [list]

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