interface FastEthernet 0/0 ip verify unicast source reachable-via {rx | any} [allow-default] [allow-self-ping] [list]
http://www.cisco.com/web/about/security/intelligence/unicast-rpf.html
interface FastEthernet 0/0 ip verify unicast source reachable-via {rx | any} [allow-default] [allow-self-ping] [list]
http://www.cisco.com/web/about/security/intelligence/unicast-rpf.html
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