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Date:      Thu, 1 Jun 2000 08:26:17 +0200
From:      Gerhard Sittig <Gerhard.Sittig@gmx.net>
To:        freebsd-stable@freebsd.org
Subject:   Re: 'stalls' from ipfw-stateful box on network connects
Message-ID:  <20000601082617.F2305@speedy.gsinet>
In-Reply-To: <200006010110.LAA04298@asuncion.dstc.edu.au>; from ggm@dstc.edu.au on Thu, Jun 01, 2000 at 11:10:16AM %2B1000
References:  <200006010110.LAA04298@asuncion.dstc.edu.au>

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On Thu, Jun 01, 2000 at 11:10 +1000, George Michaelson wrote:
> 
> I am testing a FreeBSD-4.0 stable machine as a firewall, and
> have a reasonably complex ipfw ruleset that probably does
> invoke some stateful rules.
> 
> ssh and telnet sessions to this box appear to go into a stalled
> state, where there is a 30sec pause before they re-awake and
> respond to user input.

Maybe you want to read the ipfilter HowTo (to be found at
http://www.obfuscation.org/ipf/) which contains a lot of general
firewall stuff, too.  From what you say below this sounds very
similar to an effect described therein.

> pinging the interface can wake them up again, which is why I
> suspect its something in the ipfw engine.
> 
> now clearly, for a box which is shuffling bits frequently this
> wouldn't be a problem because there'd be enough through-traffic
> to keep things ticking over.
> 
> am I mis-diagnosing things? is this also visible as a
> side-effect of apm or other stuff? 

It could just be simple(?) "misconfiguration".


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