Check your ARP table. If your machine has communicated with another
machine on the local subnet, the remote machine's MAC address should
be in the ARP table.
A few weeks ago I ended up writing a script to convert my entire ARP
table into slightly better output sorted by IP address. If anyone
want it, I've stuck a copy at:
<ftp://ftp.access.digex.net/pub/access/jkrage/arptran.pl>
Its simplistic. Has comments at the front of the file describing how
to get MAC addresses for a subnet.
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jkrage@scientech.com Joshua Krage
Network Administrator SCIENTECH, Inc. (301) 468-6425