From owner-freebsd-net Wed Aug 2 1:25:58 2000 Delivered-To: freebsd-net@freebsd.org Received: from whale.sunbay.crimea.ua (whale.sunbay.crimea.ua [212.110.138.65]) by hub.freebsd.org (Postfix) with ESMTP id DBCD537C0BD for ; Wed, 2 Aug 2000 01:25:45 -0700 (PDT) (envelope-from ru@whale.sunbay.crimea.ua) Received: (from ru@localhost) by whale.sunbay.crimea.ua (8.9.3/1.13) id LAA40548; Wed, 2 Aug 2000 11:24:58 +0300 (EEST) Date: Wed, 2 Aug 2000 11:24:58 +0300 From: Ruslan Ermilov To: Archie Cobbs Cc: Charles Mott , Erik Salander , net@FreeBSD.ORG, Julian Elischer , Brian Somers , Eivind Eklund Subject: Re: Improved PPTP support for libalias(3) Message-ID: <20000802112458.B38876@sunbay.com> Mail-Followup-To: Archie Cobbs , Charles Mott , Erik Salander , net@FreeBSD.ORG, Julian Elischer , Brian Somers , Eivind Eklund References: <200007281735.KAA25478@bubba.whistle.com> <200007281941.MAA26153@bubba.whistle.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Mailer: Mutt 1.0i In-Reply-To: <200007281941.MAA26153@bubba.whistle.com>; from archie@whistle.com on Fri, Jul 28, 2000 at 12:41:34PM -0700 Sender: owner-freebsd-net@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org On Fri, Jul 28, 2000 at 12:41:34PM -0700, Archie Cobbs wrote: > 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 > . 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. > This is all right, except libalias(3) is supposed to intercept outgoing PPTP call requests messages and alias CallID to be unique, see AliasHandlePptpOut(). -- Ruslan Ermilov Oracle Developer/DBA, ru@sunbay.com Sunbay Software AG, ru@FreeBSD.org FreeBSD committer, +380.652.512.251 Simferopol, Ukraine http://www.FreeBSD.org The Power To Serve http://www.oracle.com Enabling The Information Age To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message