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Private IP address with yahoo messenger

To: pen-test@securityfocus.com
Subject: Private IP address with yahoo messenger
From: Alcides <alcides.hercules@gmail.com>
Date: Thu, 24 May 2007 12:24:41 +0530
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Hi list,
I was wondering to have any clue on this.
While having a chat session with somebody in yahoo messenger, how is
it possible to obtain his/her Private IP address if that person is
behind a Router and/or a Firewall (NATed)?
Moreover,
Is there any way that he/she can hide successfully (behind the NAT or
something else)so that NO internal IP address is revealed?
Thanks.
Warm regards.

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