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Forum Replies

  1. “R1 receives an ARP request from R1 who is looking for the IP address of its default gateway and replies with its MAC address.”

    I think the second R1 should be Host A.

  2. Rene

    Is proxy arp used only if the destination ip address is detected to to be on a subnet that is not reachable by normal arp requests? When you changed the mask of host B to /8 it assumes the destination was local even though it was remote?


  3. Hi Harmit,

    No it won’t, the router requires an interface with a subnet in the range. If it receives any other ARP requests then it will just ignore them.


  4. Hi Will,

    That’s right. In this example, it’s a misconfiguration on the host that you can “fix” by enabling proxy ARP on the router.


  5. Hello Carlo

    Yes that is correct. In most IOS versions, proxy arp is enabled by default. This will disable it and will prevent the router from responding on behalf of another host.

    I hope this has been helpful!


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