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MAC address search

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by dutchman10 1 view

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Is there a simple way to search for a MAC address on a network. We have a Windows NT domain and several Cisco switches. we have a problem with one of our NIC's, and we only have the MAC address. I don't have the resources to load fancy software, like Fluke's Network Inspector (as much as I'd like too!). I'm looking for a way to resolve the I.P. from the MAC. I know the reverse can be done simply...
Thanks for any help.

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by bcbvale

Try the following command on each of your Cisco switches;

show arp | include xxxx.xxxx.xxxx

where xxxx.xxxx.xxxx is the mac address of the device you are trying to find.

Hopefully one of your switches had an arp entry containing the ip address for the device you are trying to find.

If you just want to locate the device physically you can run the following command on each of your Cisco switches;

show mac-address-table | include xxxx.xxxx.xxxx

This will tell you what port on your switch the device is connected to.

bcbv

by dutchman10

Thank you. This was just what I was looking for.
The 'show arp |include xxxx.xxxx.xxxx' did not work for me, but the 'show mac-address-table' was just what I needed.
Thanks again.

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