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From: Patrick McHardy <kaber@trash.net>
To: Jan Engelhardt <jengelh@linux01.gwdg.de>
Cc: netfilter-devel@lists.netfilter.org, Marek Sirdak <marek@nevision.net>
Subject: Re: (Probably) it's a bug
Date: Fri, 22 Jul 2005 19:56:56 +0200	[thread overview]
Message-ID: <42E13368.8020707@trash.net> (raw)
In-Reply-To: <Pine.LNX.4.61.0507221514440.28569@yvahk01.tjqt.qr>

Jan Engelhardt schrieb:
>>>Dear Netfilter developers:
>>>
>>>I'm using iptables to protect my company network. My Kernel version is
>>>2.6.12 and iptables 1.3.2. Today I noticed that iptables cannot control
>>>broadcast traffic. For example I'm using DHCPd (version 3.0.2).
>>
>>Hm.. isc-dhcpd uses af_packet:
>>
>>Symbol: PACKET [=y]
>>"The Packet protocol is used by applications which communicate
>>directly with network devices without an intermediate network
>>protocol implemented in the kernel, e.g. tcpdump.  If you want them
>>to work, choose Y.
> 
> Interesting because I once failed to get DHCP because the Request packets hit 
> the default DROP policy...

Some clients use AF_PACKET, others use raw sockets, others use regular
UDP sockets. Everything besides AF_PACKET can be filtered by netfilter.

      reply	other threads:[~2005-07-22 17:56 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2005-07-21 19:49 (Probably) it's a bug Marek Sirdak
2005-07-22 12:49 ` Krzysztof Oledzki
2005-07-22 13:15   ` Jan Engelhardt
2005-07-22 17:56     ` Patrick McHardy [this message]

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