linux-kernel - DHCP and iptables

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Message-ID: <20091012183441.64616r9da17njyww@www.issp.eu>
Date:	Mon, 12 Oct 2009 18:34:41 +0200
From:	lkml@...ubi.at
To:	linux-kernel@...r.kernel.org
Subject: DHCP and iptables

Hi,

The last few days I have been wondering about the fact, that I get an IP
address via
DHCP if all chains at iptables are set to drop and no accept rules set.

Does this happen on purpose?

I checked twice, if I really get an IP from my DHCP-server, checked the DHCP-
messages and a wireshark trace.

I Also tried the check_dhcp-nagios plugin, which fails if I do not allow
packets for the input chain, destination port 68, protocol udp.

Why do I get an IP address, if I drop everything?

Sincerely yours Mathias Kub
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