[clug] Re: bizare network behavior

Martin Pool mbp at sourcefrog.net
Fri Apr 4 22:51:40 EST 2003

On  4 Apr 2003, Michael Still <mikal at stillhq.com> wrote:
> On Thu, 3 Apr 2003, Martijn van Oosterhout wrote:
> > On Thu, Apr 03, 2003 at 10:43:14AM +1000, James McNeill wrote:
> > > Windows client talking TCP to Linux server. At first all seems fine, but the
> > > time between packets gets slowly greater and greater until the connection
> > > grinds to a halt. It impossible to transfer more that about 50k in any given
> > > TCP session. But, as soon as the connection is closed and re-opened, the
> > > packets flow freely again, breifly. It seems to be happening to all
> > > protocols, POP SMTP SMB and FTP. Other machines on the network seem
> > > unaffected.

If it reliably happens at about 50kB in then it sounds like something
to do with TCP window opening or path MTU discovery.  I think both of
them happen gradually over a TCP connection.

Anyhow the solution is to get tcpdump and Stevens and rub them


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