Message-ID: <20091012183441.64616r9da17njyww@www.issp.eu>
Date: Mon, 12 Oct 2009 18:34:41 +0200
From: lkml@makubi.at
To: linux-kernel@vger.kernel.org
Subject: DHCP and iptables
MIME-Version: 1.0
Content-Type: text/plain;
 charset=UTF-8;
 DelSp="Yes";
 format="flowed"
Content-Disposition: inline
Content-Transfer-Encoding: 7bit
User-Agent: Internet Messaging Program (IMP) H3 (4.3.4)
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 767
Lines: 23

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
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/