From: Patrick McHardy <kaber@trash.net>
To: Al Boldi <a1426z@gawab.com>
Cc: netfilter-devel@vger.kernel.org, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [RFD] iptables: mangle table obsoletes filter table
Date: Fri, 12 Oct 2007 14:31:35 +0200 [thread overview]
Message-ID: <470F6927.9040505@trash.net> (raw)
In-Reply-To: <200710121525.44510.a1426z@gawab.com>
Al Boldi wrote:
>>>The problem is that people think they are safe with the filter table,
>>>when in fact they need the prerouting chain to seal things. Right now
>>>this is only possible in the mangle table.
>>
>>Why do they need PREROUTING?
>
>
> Well, for example to stop any transient packets being forwarded. You could
> probably hack around this using mark's, but you can't stop the implied route
> lookup, unless you stop it in prerouting.
This also works fine in FORWARD with a little extra overhead.
If you really have to save resources, you should use PREROUTING/raw
to also avoid the creation of a connection tracking entry.
next prev parent reply other threads:[~2007-10-12 12:31 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-10-11 21:31 [RFD] iptables: mangle table obsoletes filter table Al Boldi
2007-10-12 4:35 ` Patrick McHardy
2007-10-12 4:39 ` Patrick McHardy
2007-10-12 5:37 ` Al Boldi
2007-10-12 11:48 ` Patrick McHardy
2007-10-12 12:25 ` Al Boldi
2007-10-12 12:31 ` Patrick McHardy [this message]
2007-10-12 13:18 ` Al Boldi
2007-10-12 13:23 ` Patrick McHardy
2007-10-12 22:56 ` Al Boldi
2007-10-17 22:37 ` Bill Davidsen
2007-10-17 23:24 ` Bill Davidsen
2007-10-20 3:40 ` Al Boldi
2007-10-20 4:47 ` Valdis.Kletnieks
2007-10-20 11:10 ` Jan Engelhardt
2007-10-21 4:31 ` Al Boldi
2007-10-21 4:53 ` Valdis.Kletnieks
2007-10-23 22:27 ` Bill Davidsen
2007-10-12 13:01 ` Jan Engelhardt
2007-10-12 13:30 ` Al Boldi
2007-10-12 13:39 ` Jan Engelhardt
2007-10-12 13:48 ` Patrick McHardy
2007-10-12 14:02 ` Jan Engelhardt
2007-10-12 14:03 ` Patrick McHardy
2007-10-12 22:56 ` Al Boldi
2007-10-12 23:02 ` Patrick McHardy
-- strict thread matches above, loose matches on Subject: below --
2007-10-12 5:14 Al Boldi
2007-10-18 15:41 ` Matthew Faulkner
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