Using ARP to map a network

["Jason Lewis" <jlewis () packetnexus com>]

I have searched and can't seem to find any tools to help map a network
based on ARP tables.

It seems to me, I could take ARP tables from several machines and build a
network map.  If machines were behind a router the ARP tables would show
multiple IP's with the same MAC.  With enough ARP tables, wouldn't I be
able to build a map?

Is my theory flawed?

My goal is to do passive network mapping based on any local information I
can obtain from computers or network devices.  Anyone have any ideas?

jas



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