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Date: Sun, 15 Oct 2006 13:03:49 +0200
From: Miroslav Lachman <000.fbsd@quip.cz>
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To: Dan b <thedanyes@yahoo.com>
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Cc: freebsd-net@freebsd.org
Subject: Re: reset netstat statistics
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Dan b wrote:
> Hello,
> 
> I searched the archives for this and was unable to
> find anything relevant.  I have a machine that is
> being used as a NAT Router with IPFW and IPNAT running
> 5.3-RELEASE.  I'm only using IPFW to keep track of
> traffic, no actual packet filtering is going on.
> 
> The problem is that the statistics reported by netstat
> seem to reset themselves intermittently.  Last night I
> ran netstat -ib and got an Ibytes stat of around 2.1GB
> on my sis0 adapter.  Today I ran netstat -ib and got
> an Ibytes stat of around 600MB on my sis0 adapter. 
> The system has around 29 days of uptime, and I have
> run ipfw zero a few times, but have not run netstat -z
> at all.  Let me know if you have any ideas about this.

Counter resets itself after 4GB (it is not a bug, it is feature of 32bit 
counter as mentioned by Max Laier)

Miroslav Lachman