problem with delayed ACKs?

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Hi All,

Using kernel 2.6.22.1 and 2.6.23.9 on Debian etch I have troubles
(probably) with delayed ACKs.
The problem occures when using some software which keeps a TCP connection
open for
a long period of time. (eg.: ssh, nut)

The problem occures after a longer time (about 10 minutes or so),
and the symptom is that I don't get the ACK after 200ms.
Well I don't get any packet from the server process during this 200ms.
Then comes a retransmission of the request, which is then ACKed, but not
answered,
and no further requests are being answered, just ACKed on that TCP
connection.

It's a bit strange because both ssh and nut (Network UPS Tools) should
imediately
answer. The other thing which I've noticed is that while this TCP
connection is 'dead',
I just see the ACKs in the packet count of that connection in the conntrack
table, but
not the request packets. I'm sure that this is not a firewall config
failure, because
it occures on the loopback interface too.

Can anyone help me to solve this?

Thanx in advance: Steve Szijj

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