Date: Fri, 28 Jul 2000 12:41:34 -0700 (PDT) From: Archie Cobbs <archie@whistle.com> To: Archie Cobbs <archie@whistle.com> Cc: Charles Mott <cmott@scientech.com>, Erik Salander <erik@whistle.com>, net@FreeBSD.ORG, Ruslan Ermilov <ru@FreeBSD.ORG>, Julian Elischer <julian@elischer.org>, Brian Somers <brian@Awfulhak.org>, Eivind Eklund <perhaps@yes.no> Subject: Re: Improved PPTP support for libalias(3) Message-ID: <200007281941.MAA26153@bubba.whistle.com> In-Reply-To: <200007281735.KAA25478@bubba.whistle.com> from Archie Cobbs at "Jul 28, 2000 10:35:23 am"
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Archie Cobbs writes: > > Is this a limitation of a specific server implementation, or > > a limitation of the PPTP standard? > > It's simply a limitation in our address translation module for PPTP. > There's nothing implied wrong with the standard itself or the server > implementation. > > This limitation could be eliminated with more coding, but it's > somewhat ugly (you have to make two TCP streams appear as one). Sorry, I may have misinterpreted your question... It is inherent in the PPTP standard that there be at most ONE PPTP TCP control connection between any two IP addresses. If you think about it for a second you can see why: when a machine receives a GRE packet, it identifies the call using the pair <sourceIP, CallID>. That means that there can be at most ONE entity living at sourceIP doling out CallID's for calls to the local machine/IP address.. otherwise CallID's would not be guaranteed to be unique. -Archie ___________________________________________________________________________ Archie Cobbs * Whistle Communications, Inc. * http://www.whistle.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
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