[264] in linux-net channel archive
Re: lcp-echo-failure doesn't work?
daemon@ATHENA.MIT.EDU (Michael H. Warfield)
Wed May 3 11:30:14 1995
To: linux-net@vger.rutgers.edu
Date: Wed, 3 May 1995 09:19:04 -0400 (EDT)
From: "Michael H. Warfield" <mhw@wittsend.com>
In-Reply-To: <m0s6ZAf-0006tWC@a486> from "Alexander Terczka" at May 3, 95 09:48:33 am
> > Right now, it's just a minor annoyance, since pppd can now detect
> > the problem and recover from it. It would be nice to figure out where
> > the problem is and fix it though. I've been pawing through serial code,
> > ppp code, and network code but have come up empty handed. Anyone with some
> > more suggestions as to where to look, let me know and I check'm out.
> I had lockups on ppp-connections for a long time. The error was, that
> TCP in the Linux kernel and TCP in a Cisco router (V ~9.1) didn't like
> each other. It has to do with the windowing mechanism in the TCP layer.
> I know, this would not lock up the whole connection, but only one TCP
> connection. But perhaps it looks like a total modem lock in your
> situation. To fix the problem I simply said "PC/TCP compatibility mode : YES"
Well... That would be nice if it would fix my problem but...
I already have specified PC/TCP compatibility mode: YES because I have some
MS-DOG systems running PC/TCP. I was somewhat wondering if that was the CAUSE
of the problem, since I have had no opportunity to test for any significant
period of time with it turned off. This is also the WHOLE link that
is locked. Even "connectionless" services (UDP, ICMP, etc) are dead.
> Alan told me, that there is a real patch that linux tcp can handle ciscos,
> and that I should try it, but as my IP-provider upgrade the cisco software
> to 10.2 I can't reproduce the bug even without the patch.
Now that's interesting... What is that patch? I'm not running
a cisco but I would sure like to know what areas of code are "gray" enough
to trip over a problem like this. My ISP was running a Portmaster and is
now running Netblazers. No effect as far as I can tell.
> btw: linux is the best OS I ever used. :)
Agreed!
> AlexT
> (alext@cslab.tuwien.ac.at)
Regards,
Mike
--
Michael H. Warfield | (404) 925-8248 | mhw@WittsEnd.com
(The Mad Wizard) | NIC whois: MHW9 | mathcs.emory.edu!wittsend!mhw
An optimist believes we live in the best of all possible worlds.
A pessimist is sure of it! | http://www.wittsend.com/mhw/
