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Date: Sun, 24 Dec 2000 10:14:55 +0100
From: Andi Kleen <ak@suse.de>
To: Cesar Eduardo Barros <cesarb@nitnet.com.br>
Cc: linux-kernel@vger.kernel.org
Subject: Re: TCP keepalive seems to send to only one port
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In-Reply-To: <20001223213156.A1947@flower.cesarb>
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In-Reply-To: <20001223213156.A1947@flower.cesarb>; from cesarb@nitnet.com.br on Sat, Dec 23, 2000 at 09:31:56PM -0200
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On Sat, Dec 23, 2000 at 09:31:56PM -0200, Cesar Eduardo Barros wrote:
> 
> I've been doing some experiments with the keepalive code in 2.4.0-test10 here
> (I want to avoid the 2.2.x NAT I'm using (for which I don't have root) from
>  timing out my connections). To test it, I reduced both tcp_keepalive_time and
> tcp_keepalive_intvl to 1. Using ethereal, I saw that the keepalives were sent
> as expected, but only for one of the two idle TCP connections I had to a given
> host (I was testing with two remote hosts, each with two idle TCP connections,
> one in port 5500 and the other in port 5501). I only saw activity on 5500, yet
> netstat told me both were still active.

I just tried it and it works fine here with 2.4.0-test13-pre

You should be aware that the sysctls are only picked up after a timer timeout
or when a socket is newly created. When the sockets are already active it
takes a timeout for them to take effect. The default timeout is 2 hours.


-Andi
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