Date: Tue, 18 Jun 2002 20:32:43 -0400 From: Mike Tancsa <mike@sentex.net> To: Brian Somers <brian@Awfulhak.org> Cc: freebsd-net@FreeBSD.ORG Subject: Re: tracking down strange MTU issues with PPPoE) Message-ID: <5.1.0.14.0.20020618203201.07212f30@192.168.0.12> 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>
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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 <mike@sentex.net> 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 <brian@Awfulhak.org> <brian.somers@sun.com>
> <http://www.Awfulhak.org>; <brian@[uk.]FreeBSD.org>
>Don't _EVER_ lose your sense of humour ! <brian@[uk.]OpenBSD.org>
--------------------------------------------------------------------
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
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