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Subjecttcp connections dropped in 2.6.7
[ Please CC replies to me.  Thanks! If there is a more specific list, I 
will go there. ]

Hello,

This one has really got me stumped, and I would like to debug it if
possible (although my boss would really like the machine to 'just
work'). I think it's in the kernel because it affects all userspace
programs equally.

The problem:

When logged into the machine via ssh, every so often the connection goes
down (not frozen, it goes away completely) and attempts to log back in
fail. Seemingly, networking comes back up ok if, from the server (the
one with the problem) I generate some outgoing traffic - even a single
icmp packet. Pings to the machine in question normally run around 0.12
ms from my machine, but slow down to 2 or 3 ms during the problem.

On a suggestion from someone, I tried turning off the windowing bit
which has apparently caused some problems lately, but that doesn't help
(I'm not going through a router in any case).

There are no messages at all in logfiles. tcpdump doesn't show anything
that looks obvious (to me at least... could be me not seeing something).

Seeing as how outgoing traffic seems to kick the connection back into
shape, as a crutch I tried leaving a ping running, but it went down just
the same.

As a network card, I'm using a realtek. Initially I observed the
problem with a forcedeth card, which we substituted thinking that might
be the problem.

I don't seem to be able to recreate the problem. It "just happens"
every now and then.

I'll put a dmesg up at http://dedasys.com/dmesg.txt

Thankyou for your time,
--
David N. Welton
davidw@eidetix.com
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