Can a regular cisco router prevent APR spoofing?

Unanswered Question
Jul 14th, 2010

Can an cisco router detect an end device configured with router address? Also, why cisco router kept sending loop packets? Via wireshark, I saw a lot of them.

I have this problem too.
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Nagaraja Thanthry Wed, 07/14/2010 - 17:04


If you are talking about duplicate address detection, that is not possible on the router. You need to manually confiugre your DHCP server to exclude the router IP address. Also, the router is not capable of doing ARP inspection on the routed ports. It seems to be supported only on switch modules.

The loopback packets are used by the switch to detect any physical loop in the network. If the switch gets the loop packet that it had sent on an interface back on a different interface (or on the same interface), it determines that there is a physical loop and reports it.

Hope this helps.




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