From owner-freebsd-questions  Thu Jul 19 14:33:12 2001
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Date: Thu, 19 Jul 2001 16:33:05 -0500
From: Jeff Sapp <jasapp@pelennor.net>
To: Beech Rintoul <akbeech@anchoragerescue.org>
Cc: freebsd-questions@freebsd.org
Subject: Re: netcraft uptime
Message-ID: <20010719163305.A27165@pelennor.net>
References: <01071912454000.51519@galaxy.anchoragerescue.org>
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In-Reply-To: <01071912454000.51519@galaxy.anchoragerescue.org>; from akbeech@anchoragerescue.org on Thu, Jul 19, 2001 at 12:45:40PM -0800
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I believe that they figure a computer's uptime by looking at the timestamp 
option of tcp packets. The field is incremented every 500ms, and is 
set to 0 on reboot.

You can turn the tcp options on by:

sysctl -w net.inet.tcp.rfc1323=1

The rfc has lots of cool stuff and it's worth a read.

Jeff

On Thu, Jul 19, 2001 at 12:45:40PM -0800, Beech Rintoul wrote:
> I was looking at netcraft's site today and noticed that uptime doesn't work 
> with FBSD servers. Anyboy have any info on this? Like how they do it and can 
> my server be configured to show it?
> 
> TIA
> 
> Beech
> -- 
> Micro$oft: "Where can we make you go today?"
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