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Date:      23 Feb 2002 18:56:46 -0600
From:      abaugher@adams.net
To:        freebsd-stable@freebsd.org
Subject:   Network stalls with 4.5
Message-ID:  <haruchai.m3heo766k1.fsf@esc.pike.il.us>
In-Reply-To: <86326101799.20020211140641@mirror.kiev.ua>

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Hi all,

I remotely administer some FreeBSD boxes.  I recently
upgraded them from various 4.4 and 4.3 versions to 4.5-RC.
Now I have two clients who say their connections to the
boxes are stalling, anywhere from a few seconds to several
minutes.  They can even have one connection stall, yet make
a second one that works fine while the first one sits stuck.

Today I upgraded one of the machines to 4.5-STABLE, and it
made no difference.

These clients both use DSL (different providers in different
states), and one of them tried a friend's cable modem, and
noticed the same problem.  It happens with ssh connections
and pop3, so it doesn't seem to be a problem with a certain
program.  I connect to these systems over a modem, and I'm
not having any trouble.  They also seem to have no trouble
talking to each other over the 100Mb LAN.  Lots of other
people connect to these systems, and we're not getting other
complaints, so it seems to be limited to these guys with
high-speed access.

The machines have Intel Pro 10/100B NICs, so they're using
the fxp driver.  The only thing I do special on them is to
run this command in rc.local:

  /sbin/ifconfig fxp0 media 100baseTX mediaopt full-duplex

That's because if I let them auto-detect, they don't seem to
negotiate correctly with the switch, and move data very
slowly.

Any ideas?  The key seems to be the DSL and 4.5, but I can't
figure how that is causing the problem.


Thanks,
Aaron
-- 
abaugher@esc.pike.il.us - Coatsburg, IL, USA
Extreme Systems Consulting - http://esc.pike.il.us/
CGI, Perl, and Linux/Unix Administration

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