From mboxrd@z Thu Jan  1 00:00:00 1970
From: Martijn Lievaart <m@rtij.nl>
Subject: Re: ip routing after changing mac address to a virtual one
Date: Sun, 03 Dec 2006 23:03:54 +0100
Message-ID: <457349CA.9060006@rtij.nl>
References: <20061130164505.99758.qmail@web50103.mail.yahoo.com>
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To: first last <doctor_konkord@yahoo.com>
Cc: netfilter@lists.netfilter.org

first last wrote:

>Hi Mike,
>
>Yes, eth1 gets its IP address from DHCP server. DHCP
>server always gives me the same IP address because it
>knows my MAC address. So I only can get a different IP
>address by changing my MAC address.
>  
>

[ Please don't toppost ]

Try to shutdown the interface, change the MAC, then bring the interface 
back up. Masquerading is a bit strange and I'm not completely sure what 
will work when. However, this way, it should definately work.

HTH,
M4