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Date:      Sat, 25 Mar 2006 10:00:56 -0500
From:      "Grant Peel" <gpeel@thenetnow.com>
To:        <freebsd-questions@freebsd.org>
Subject:   Re: em device on 4.x: ifconfig alias issue 
Message-ID:  <013501c6501c$ee8ecc40$6401a8c0@GRANT>

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Hi Marc,

I don't pretend to know anything about Address Resolution and Routing, but 
one thing I know (through many hours of frustration), is that an aliased 
address (in your case, somehting like em0:23), IF the ip address being 
aliases, belongs in the same subnet as anotherone on the same machine, the 
second one must use a 255 subnet ( /0 ?).

example:

em0            192.168.0.1 255.255.255.0
em0_0          192.168.0.2 255.255.255.255
...
em0_23         10.10.10.10 255.255.255.192
em0_43         10.10.10.11 255.255.255.255
em0_59         10.10.10.15 255.255.255.255

Hope this helps, if not soory about the waste of time!

-Grant 





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