From: "David S. Miller" <davem@davemloft.net>
Subject: Re: [PATCH] Warn people that ipchains and ipfwadm are going away.
Date: Tue, 21 Sep 2004 15:36:00 -0700
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To: Marc Ballarin <Ballarin.Marc@gmx.de>
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On Wed, 22 Sep 2004 00:36:46 +0200
Marc Ballarin <Ballarin.Marc@gmx.de> wrote:

> I just added some warnings, but modprobe ipchains always fails on
> 2.6.9-rc2:
> 
> FATAL: Error inserting ipchains
> (/lib/modules/2.6.9-rc2-rcf/kernel/net/ipv4/netfilter/ipchains.ko): Device
> or resource busy

You can't have ipchains and iptables loaded at the same time.
You must first manually unload iptables, then you can
successfully load the ipchains module.