From owner-freebsd-net Mon Jun 24 12:58:24 2002
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Date: Mon, 24 Jun 2002 15:59:39 -0400
To: "Julian H. Stacey" <jhs@jhs.muc.de>
From: Mike Tancsa <mike@sentex.net>
Subject: Re: tracking down strange MTU issues with PPPoE)
Cc: freebsd-net@FreeBSD.ORG, Udo.Erdelhoff@gmx.net
In-Reply-To: <200206241949.g5OJnjq01221@lapa.jhs.private>
References: <Message from Mike Tancsa <mike@sentex.net>
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Hi,
Thanks for the suggestion. If I recall correctly, the tcpmssd
daemon was to fix client connection issue behind the FreeBSD box, not
directly from the FreeBSD box. The problems we are seeing are directly on
the FreeBSD box, but only with certain DSL concentrators. Also, I thought
the ppp client on FreeBSD has the mss fix built in.
from the ppp man pages,
[tcp]mssfixup
Default: Enabled. This option tells ppp to adjust TCP SYN pack-
ets so that the maximum receive segment size is not greater than
the amount allowed by the interface MTU.
---Mike
At 09:49 PM 24/06/2002 +0200, Julian H. Stacey wrote:
>Mike Tancsa wrote:
>Re DSL ...
>
> > (Note, I have tried various MTU and MRU settings.
> > Thanks for any pointers.
>
>Perhaps you need /usr/ports/net/tcpmssd
> - TCP Maximum Segment Size option corrector
>
>I recently got DSL with Deutsche Telekom, then read the very enjoyable
> http://www.ruhr.de/home/nathan/FreeBSD/tdsl-freebsd.html
> Author: Udo.Erdelhoff@gmx.net
> Language: German (which luckily I speak, but config fragments
> are readable by all of course)
>& I got the impression I too would have a problem & need to install
>tcpmssd, but your mail has reminded I haven't seemed to need to yet,
>& on looking with netstat -I tun0
> Name Mtu Network Address Ipkts Ierrs Opkts
> Oerrs Coll
> tun0 1492 <Link#20> 116652 0 83310 0
> 0
> tun0 1492 fe80:14::20
> fe80:14::200:b4ff 0 - 0 - -
> tun0 1492 217.235.114 pD9EB72AA.dip.t 103126 - 72229 -
> -
>so with 1492 I guess I havent noticed many failed connections.
>Good luck, I hope tcpmssd helps.
>
>Julian Stacey Munich Unix (FreeBSD, Linux etc) Independent
>Consultant
>jhs@bim.bsn.com http://bim.bsn.com/~jhs/
> Ihr Rauchen = mein allergischer Kopfschmerz ! Schnupftabak
> probieren !
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