From owner-freebsd-stable Fri Nov 3 9:17:45 2000 Delivered-To: freebsd-stable@freebsd.org Received: from smtp6.mindspring.com (smtp6.mindspring.com [207.69.200.110]) by hub.freebsd.org (Postfix) with ESMTP id 2AC0837B4CF for ; Fri, 3 Nov 2000 09:17:39 -0800 (PST) Received: from sloth (user-vcaunlk.dsl.mindspring.com [216.175.94.180]) by smtp6.mindspring.com (8.9.3/8.8.5) with SMTP id MAA27646; Fri, 3 Nov 2000 12:17:25 -0500 (EST) From: "Timothy L. Robertson" To: "Christoph Sold" , Subject: RE: Flaky IP Connection Date: Fri, 3 Nov 2000 09:17:24 -0800 Message-ID: MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook IMO, Build 9.0.2416 (9.0.2910.0) Importance: Normal X-MimeOLE: Produced By Microsoft MimeOLE V5.00.2314.1300 In-Reply-To: <3A0295F2.972BC9E3@i-clue.de> Sender: owner-freebsd-stable@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 > -----Original Message----- > From: Christoph Sold [mailto:so@server.i-clue.de] > Sent: Friday, November 03, 2000 2:40 AM > To: Timothy L. Robertson > Subject: Re: Flaky IP Connection > > IIRC, a recent article in german magazine c't discussed this problem: > Since PPPoE needs room for PPP headers in each ether packet, you loose > 12 bytes per packet. Your remote site announces this correctly, causing > packet fragmentation. > > maybe I'm wrong, so please anybody speak up with more experience in > networking? > > HTH > -Christoph Sold > > This makes sense. The MTU reported by tcpdump seems to always be 12 bytes less than the MTU I set tun0 to. What do I do about it, though, to keep my connection flowing? The TCP/IP stack is supposed to probe routers by setting the don't fragment bit and watching for icmp packets and set the MTU in routing tables accordingly, but I get the feeling something is not working right here. Should I ask this question of freebsd-bugs? - -Tim -----BEGIN PGP SIGNATURE----- Version: PGPfreeware 6.5.8 for non-commercial use iQA/AwUBOgLy5xJDu7xQsK72EQLJBwCg8aZgk+1iNGOiLvAu4F+68hrzocQAnjZk 89B1ApWDFhWWBzX606yb7lyr =CD4/ -----END PGP SIGNATURE----- To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message