From owner-freebsd-stable Fri Jan 14 15:14:51 2000 Delivered-To: freebsd-stable@freebsd.org Received: from awfulhak.org (dynamic-22.max4-du-ws.dialnetwork.pavilion.co.uk [212.74.9.150]) by hub.freebsd.org (Postfix) with ESMTP id 1259E14FFF; Fri, 14 Jan 2000 15:14:38 -0800 (PST) (envelope-from brian@Awfulhak.org) Received: from hak.lan.Awfulhak.org (root@hak.lan.Awfulhak.org [172.16.0.12]) by awfulhak.org (8.9.3/8.9.3) with ESMTP id XAA42670; Fri, 14 Jan 2000 23:14:26 GMT (envelope-from brian@lan.awfulhak.org) Received: from hak.lan.Awfulhak.org (brian@localhost.lan.Awfulhak.org [127.0.0.1]) by hak.lan.Awfulhak.org (8.9.3/8.9.3) with ESMTP id IAA00906; Fri, 14 Jan 2000 08:58:10 GMT (envelope-from brian@hak.lan.Awfulhak.org) Message-Id: <200001140858.IAA00906@hak.lan.Awfulhak.org> X-Mailer: exmh version 2.1.0 09/18/1999 To: mi@aldan.algebra.com Cc: Bill Fumerola , Mikhail Teterin , Stan Brown , stable@freebsd.org, brian@freebsd.org, brian@hak.lan.Awfulhak.org Subject: Re: IP Tunneling, is it possible? In-Reply-To: Message from Mikhail Teterin of "Thu, 13 Jan 2000 12:58:56 EST." <200001131758.MAA52224@misha.cisco.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Date: Fri, 14 Jan 2000 08:58:10 +0000 From: Brian Somers Sender: owner-freebsd-stable@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG > Bill Fumerola once wrote: > > > On Thu, 13 Jan 2000, Mikhail Teterin wrote: > > > > > I love my PPP over SSH connection. Basicly, ppp on one machine > > > invokes ssh to login to the other side and start ``ppp -direct'' > > > there. Once the connection is up, both ends can route packets > > > to/from the newly created tun-interfaces enabling other machines on > > > the LANs to see it all. > > > > ppp+ssh has some flaws to it. Performance can be choppy and the reason > > (If I'm pulling out of my memory banks what Brian told me at > > FreeBSDcon properly) is that there are so many layer, each with its > > own error correction, compression, etc that wierd bursts and such can > > happen. > > This is true. I enable compression in ssh, but disable it in PPP. Still, > I suppose, it is imperfect. I'm wondering if changing the MTU/MRU will > help (and in what direction). It does, however, completely emulate the > net interface -- I can ftp, rsh, run X, etc. over such connection -- > even rwhod works (must be started after the connction is established). > > > > This works perfect to get a normal connection through a one-way > > > firewall too, BTW. > > > > Which is the only reason I use it. I think the only way to defeat the double-tcp-retransmit mess is if it were somehow possible to tell the higher level of TCP that your transport is reliable. This is quite an interesting thought - it also applies to ISDN for example - I'd like to tell the tcp stack that this particular interface address uses a reliable transport and that it should not try to retransmit. Unfortunately, I know nothing about the tcp stack :-( > -mi -- Brian Don't _EVER_ lose your sense of humour ! To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message