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Date:      Wed, 19 Apr 2000 15:18:02 -0600 (MDT)
From:      Charles Mott <cmott@scientech.com>
To:        Archie Cobbs <archie@whistle.com>
Cc:        Ruslan Ermilov <ru@FreeBSD.ORG>, julian@elischer.org, brian@Awfulhak.org, ari@suutari.iki.fi, perhaps@yes.no, net@FreeBSD.ORG, Erik Salander <erik@whistle.com>
Subject:   Re: Improved PPTP support for libalias(3)
Message-ID:  <Pine.LNX.4.10.10004191515480.18305-100000@if.scientech.com>
In-Reply-To: <200004191819.LAA27198@bubba.whistle.com>

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> I'm not that familiar with the libalias code (erik@whistle.com is
> more familiar), but am familiar with PPTP. Are you swizzling the
> TCP stream (port 1723) at all? If not, then it's probably not going
> to work .. or at least, not when two clients use the same Call ID.
> 
> PPTP is like active mode FTP in that the Call ID (FTP -> port #) is
> embedded in the TCP stream and must be swizzled. Unlike FTP however,
> the TCP stream won't shrink or expand.

It seems like the PPTP server address and call ID would provide
enough information to correctly rewrite packets (i.e. a given
server will not have duplicate call ID's).

However, you are also indicating that the the control stream
must be modified.



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