From owner-freebsd-net Mon Nov 26 18:27:50 2001 Delivered-To: freebsd-net@freebsd.org Received: from tomts9-srv.bellnexxia.net (tomts9.bellnexxia.net [209.226.175.53]) by hub.freebsd.org (Postfix) with ESMTP id 0B67937B405 for ; Mon, 26 Nov 2001 18:27:44 -0800 (PST) Received: from xena.gsicomp.on.ca ([199.243.149.34]) by tomts9-srv.bellnexxia.net (InterMail vM.4.01.03.16 201-229-121-116-20010115) with ESMTP id <20011127022743.ZYIQ20714.tomts9-srv.bellnexxia.net@xena.gsicomp.on.ca>; Mon, 26 Nov 2001 21:27:43 -0500 Received: from hermes (hermes.gsicomp.on.ca [192.168.0.18]) by xena.gsicomp.on.ca (8.11.1/8.11.1) with SMTP id fAR2JUW55053; Mon, 26 Nov 2001 21:19:30 -0500 (EST) (envelope-from matt@gsicomp.on.ca) Message-ID: <006a01c176eb$172f6a20$1200a8c0@gsicomp.on.ca> From: "Matthew Emmerton" To: "Julian Elischer" Cc: References: Subject: Re: Very strange network behaviour - can anyone help me analyse tcpdump output? Date: Mon, 26 Nov 2001 21:27:40 -0500 MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 5.50.4807.1700 X-MimeOLE: Produced By Microsoft MimeOLE V5.50.4807.1700 Sender: owner-freebsd-net@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.org > On Mon, 26 Nov 2001, Matthew Emmerton wrote: > > > Hi all, > > > > In the continuing saga of IPSec over PPPoE for a retail POS environment that > > I'm maintaing, the problems seem to become more complex as time goes on. > > > > The network is quite simple: > > [ LAN #1 ] - [ FreeBSD Gateway #1 ] - [ ISP ] - [ FreeBSD Gateway #2 ] - [ > > LAN #2 ] > > > > Both LANs connect using PPPoE with the same ISP, and are one hop apart > > (according to traceroute). > > > > The problem is that a connection from the Internet (anywhere) to either of > > the FreeBSD gateways will "hang". Usually I can login but doing an 'ls -al' > > will display a few lines of text and then nothing. This happens using a > > bunch of telnet clients (Anzio on Win2K, Win2K and Win95 native, FreeBSD) > > from various ISPs, as well as *between* the gateways, so the problem is most > > definitely related to the ISP providing us service. However, they seem to > > think that it's our problem ("none of the customers that use Windows have > > this problem -- must be that Unix thing that you're using"). > > If you are using gif, make sure it has a small MTU (try 512 bytes) belmont.heers.on.ca# ifconfig gif0 gif0: flags=8011 mtu 1280 inet 10.0.2.2 --> 10.0.2.130 netmask 0xffffffff belmont.heers.on.ca# ifconfig gif0 mtu 512 ifconfig: ioctl (set mtu): Invalid argument belmont.heers.on.ca# gifconfig gif0 mtu 512 gifconfig: mtu: bad value belmont.heers.on.ca# How am I supposed to change the MTU? (These machines are running 4.3-RELEASE-p12) -- Matt Emmerton To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message