Ethereal-users: [Ethereal-users] Where to find machine with mac address on network

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From: Tony Wong <twong@xxxxxxxxxxxxxxxxxxx>
Date: Mon, 18 Jun 2001 09:31:32 -0700
When I capturing packets with ethereal, I get a lot of MAc addresses both in the source and destination. Where can i find what machine this mac address is on on my network?
 
Also why does the source and destination changes : some ip addresses and some mac addresses?
 
Thanks