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From: John Murphy <jfm@blueyonder.co.uk>
To: Antoine Jacoutot <ajacoutot@lphp.org>
Date: Sat, 26 Apr 2003 16:26:45 +0100
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Subject: Re: ipfw dynamic rule timeout
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Antoine Jacoutot <ajacoutot@lphp.org> wrote:

>Hi !
>
>I'm having a problem with ipfw and dynamic rules timeout.
>For exemple, when I ssh to a distant machine, if I don't type anything =
for=20
>like 30 seconds, the connexion is dropped.
>I read this in ipfw man page:
>
>"Dynamic rules expire after some time, which depends on the status of =
the
>flow and the setting of some sysctl variables.  See Section SYSCTL
>VARIABLES for more details.  For TCP sessions, dynamic rules can be
>instructed to periodically send keepalive packets to refresh the state =
of
>the rule when it is about to expire."
>
>So I tried to following command and got this error:
># sysctl net.inet.ip.fw.dyn_keepalive=3D1
>sysctl: unknown oid 'net.inet.ip.fw.dyn_keepalive'
>
>Anyone has an idea how to increase the default timeout value.

Probably not much help to you, but you could try:

sysctl -a | grep keepalive

to see what is available.  The only one I see on 4.8 is:

net.inet.tcp.always_keepalive: 1

I'm not actually using ipfw though.

John.