Jon Marshall Mon, 10/13/2008 - 23:33
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If you mean find the IP address from the mac-address by interrogating your router then the answer is no.

Mac-addresses are only local to the LAN so if the device is 4 or 5 hops away it the packet on your router will only have the mac-address of the last hop.


csc010854800 Tue, 10/14/2008 - 00:02
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HOST 1----R1--R2--R3-----R4-----R5---HOST 2

please clarify , if i have a mac-address of HOST 2 , then which Router will be the last hop for HOST 1 ...... and the command for that ???

Mo'ath Al Rawashdeh Tue, 10/14/2008 - 00:55
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For your scenario above, you can know the IP address of Host2 from the MAC by issuing the "R5# show arp" command on router 5 only, as this router is the default gateway for Host2.

Cheers mate.


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