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Old 06-30-2004, 02:09 AM   #1
Registered: May 2003
Location: Norway
Distribution: Ubuntu / Debian
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Is it possible to find an IP address from a MAC-adress?

I'm partly managing a switched network (a _large_ one) where some ahole has brought blaster into our network. 99% of the hosts are patched, but some computers have been set up for testing, and the admins haven't patched them. We've set up a fake route to a local, and from this host, we can discover the mac-address of the host infected. The problem is that blaster is spoofing ip-addresses, and I'm wondering if there is a way to find the real ip-address. The network is covering a large area geographically, and the whole network is a switched WAN..

Am I in deep trouble (well.. Only one host infected for now), or is it possible to trace the address? I've tried arping1 <mac-address>, but I don't get a respond..

Any good ideas, or any suggestion of something I might have missed?
Old 06-30-2004, 02:48 AM   #2
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arp table

If you are on a managed switched network, then you can lookup the arp table log on the switch/router to get the port number/ip. If you are on an unmanaged switched network, then you have no tracking via that switch/router and need to arp the live client connection in question.


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