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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)
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> > 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).
> 
> In practice, that may work, but AFAIK the call ID is scoped
> only to the control stream session, not to the entire server.
> 
> So in theory at least you can have two separate TCP connections to
> the same server utilizing the same Call ID for different connections.