From owner-freebsd-net Tue Jun 18 17:36:51 2002 Delivered-To: freebsd-net@freebsd.org Received: from vinyl2.sentex.ca (vinyl2.sentex.ca [199.212.134.13]) by hub.freebsd.org (Postfix) with ESMTP id 99E0937B405 for ; Tue, 18 Jun 2002 17:36:37 -0700 (PDT) Received: from house.sentex.net (cage.simianscience.com [64.7.134.1]) (authenticated bits=0) by vinyl2.sentex.ca (8.12.3/8.12.2) with ESMTP id g5J0aTdg061502; Tue, 18 Jun 2002 20:36:33 -0400 (EDT) (envelope-from mike@sentex.net) Message-Id: <5.1.0.14.0.20020618203201.07212f30@192.168.0.12> X-Sender: mdtancsa@192.168.0.12 X-Mailer: QUALCOMM Windows Eudora Version 5.1 Date: Tue, 18 Jun 2002 20:32:43 -0400 To: Brian Somers From: Mike Tancsa Subject: Re: tracking down strange MTU issues with PPPoE) Cc: freebsd-net@FreeBSD.ORG In-Reply-To: <20020619003326.6cc5740d.brian@Awfulhak.org> References: <5.1.0.14.0.20020618163928.05018cf0@marble.sentex.ca> <5.1.0.14.0.20020618163928.05018cf0@marble.sentex.ca> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; format=flowed 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 Yes, that did it! Thanks very much! What is different about that, and me setting it on the other end as part of the virt-template ? ---Mike At 12:33 AM 6/19/2002 +0100, Brian Somers wrote: >Perhaps adding > > set mtu max 1452 > >will help ? > >On Tue, 18 Jun 2002 16:54:49 -0400, Mike Tancsa wrote: > > > > The DSL whole supplier we use (Bell Canada) has been turfing their Redback > > SMSes and moving to an ERX from unisphere networks. > > > > With the Redback, all was great... I had a FreeBSD box acting as a NAT > > gateway for a number of Windows boxes and all was great. Then, the > > customer got moved over to one of these ERXes and there is now some > strange > > MTU problem. Couple of things. Supposedly the default MTU on the ERX is > > 1472 (or 1452) depending on who you talk to and not 1492. > > > > e.g. when doing a fetch to > > >> lynx2.8.4rel.1.tar.bz2 doesn't seem to exist in /usr/ports/distfiles/. > > >> Attempting to fetch from http://lynx.isc.org/current/. > > Receiving lynx2.8.4rel.1.tar.bz2 (1940531 bytes): 0%^C > > 16682 bytes transferred in 89.5 seconds (186.41 Bps) > > fetch: transfer interrupted > > > > Notice the speed... Its totally brutal. yet, a transfer from just a few > > hops away is fine. > > > > My question is, how can I track this problem down ? There seems to be > some > > strange interaction with FreeBSD because if I put a Windows box on the > > other end, it does not suffer from this same problem. I can easily repeat > > the problem, but the question is, how can I track down the issue and then > > explain it to my telco. > > > > (Note, I have tried various MTU and MRU settings. > > > > Thanks for any pointers. > > > > 4.6-STABLE FreeBSD 4.6-STABLE #0: Tue Jun 18 > > > > > > default: > > set log Phase Chat LCP IPCP CCP tun command > > ident user-ppp VERSION (built COMPILATIONDATE) > > > > # Ensure that "device" references the correct serial port > > # for your modem. (cuaa0 = COM1, cuaa1 = COM2) > > # > > set device /dev/cuaa1 > > > > set speed 115200 > > set dial "ABORT BUSY ABORT NO\\sCARRIER TIMEOUT 5 \ > > \"\" AT OK-AT-OK ATE1Q0 OK \\dATDT\\T TIMEOUT 40 CONNECT" > > set timeout 180 # 3 minute idle timer (the > default) > > enable dns # request DNS info (for > resolv.conf) > > > > > > pppoe: > > set device PPPoE:fxp1 > > #set mtu 1452 > > #set mru 1452 > > set speed sync > > enable lqr > > set lqrperiod 5 > > set cd 5 > > set dial > > set login > > set timeout 0 > > disable deflate pred1 mppe > > deny deflate pred1 mppe > > set authname user@example.com > > set authkey thepassword > > set ifaddr 10.0.0.1/0 10.0.0.2/0 255.255.255.0 0.0.0.0 > > add default HISADDR > > > > > > > > ---Mike > > -------------------------------------------------------------------- > > Mike Tancsa, tel +1 519 651 3400 > > Sentex Communications, mike@sentex.net > > Providing Internet since 1994 www.sentex.net > > Cambridge, Ontario Canada www.sentex.net/mike > > > > >-- >Brian > >Don't _EVER_ lose your sense of humour ! -------------------------------------------------------------------- Mike Tancsa, tel +1 519 651 3400 Sentex Communications, mike@sentex.net Providing Internet since 1994 www.sentex.net Cambridge, Ontario Canada www.sentex.net/mike To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message