Reverse ARP on Catalyst 3750E

Unanswered Question
Apr 10th, 2009

I am running a Catalyst 3750E with software version 12.2(46)SE. I am trying to find what ip address is connected to one of my gigabit ethernet switch ports but it appears the switch doesn't support reverse ARP and it also doesn't allow for IP accounting to be run on the individual ethernet ports either. Does anyone know how I can ascertain the ip address of the PC that this port is connected to? Any assitance is greatly appreciated.

I have this problem too.
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lamav Fri, 04/10/2009 - 12:20


You can view the MAC address table to find the MAC address of the connected PC.

Then you can go to the layer 3 device that hosts that subnet and view the arp table to see which IP address is bound to that MAC.

sh mac-address table - on the l2 switch

sh ip arp | in xxxx.yyyy.zzzz -- on the L3 switch




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