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Re: Weird networking problem

To: "Gabe E. Nydick" <gnydick@xxxxxxxxxxxxx>
Subject: Re: Weird networking problem
From: Steve Lord <lord@xxxxxxx>
Date: 28 Feb 2002 13:05:59 -0600
Cc: linux-xfs@xxxxxxxxxxx
In-reply-to: <B8A3BE94.2AD4%gnydick@xxxxxxxxxxxxx>
References: <B8A3BE94.2AD4%gnydick@xxxxxxxxxxxxx>
Sender: owner-linux-xfs@xxxxxxxxxxx
On Thu, 2002-02-28 at 13:01, Gabe E. Nydick wrote:
> Hey folks,
> 
>     I have a stock redhat 7.2 with all of the users space xfs stuff added
> and a vanilla patched 2.4.17-xfs-smp kernel. That can't connect via port 25
> to certain hosts.  When I down rev my kernel to 2.4.14-xfs-smp, it goes
> away.  (I don't think there is anything special about 2.4.14, it is just the
> previous kernel I had)
> 
> Hardware
> - dual PIII 1GHz
> - dual eepro100 using e100.o or eepro100.o as drivers
> 
> Hosts I couldn't connect to
> - mta01.cdpd.airdata.com
> - mail.mailzone.net
> Plus others
> 
> I haven't been able to find anyone else with networking issues under 2.4.17,
> so I figured maybe it is a 2.4.17-xfs specific thing.  Anybody had similar
> issues?  Can anyone else using 2.4.17-xfs-smp try to telnet to these hosts
> over port 25 and tell me if they get the same problem?
> 
> Thanks,
> Gabe

I don't think it is xfs specific, there is a tcp option which got
twiddled I think. This page explains the 'feature'

http://gtf.org/garzik/ecn/

and I think /proc/sys/net/ipv4/tcp_ecn controls the flag being on or
off.

Steve


-- 

Steve Lord                                      voice: +1-651-683-3511
Principal Engineer, Filesystem Software         email: lord@xxxxxxx


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