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Date: Sat, 19 Jul 2008 13:06:35 +0200
From: Angelo Turetta <aturetta@commit.it>
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To: Rudi Kramer - MWEB <rkramer@mweb.com>
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Subject: Re: GRE Limitation
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Rudi Kramer - MWEB wrote:
> I had the same issue and when I checked with our ms-admin team they said
> it was a Microsoft limitation.

Quite the opposite. Since Windows2000 MS introduced, or started using, a 
CallID in the GRE header.
Remember, many-to-one NAT has only become widely used/mandatory in 
recent years, I remember getting a full ClassC subnet from my first 
provider (128Kbps, ca. 1995-1996) without even asking.

Angelo Turetta
Modena - Italy