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From: Patrick McHardy <kaber@trash.net>
To: Herbert Xu <herbert@gondor.apana.org.au>
Cc: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>,
	netdev@oss.sgi.com, netfilter-devel@lists.netfilter.org,
	Yair@arx.com, linux-kernel@vger.kernel.org
Subject: Re: Re-routing packets via netfilter (ip_rt_bug)
Date: Wed, 27 Apr 2005 14:05:06 +0200	[thread overview]
Message-ID: <426F7FF2.4070506@trash.net> (raw)
In-Reply-To: <20050427115414.GA22562@gondor.apana.org.au>

Herbert Xu wrote:
> Here is another reason why these packets should go through FORWARD.
> They were generated in response to packets in INPUT/FORWARD/OUTPUT.
> The original packet has not undergone SNAT in any of these cases.
> 
> However, if we feed the response packet through LOCAL_OUT it will
> be subject to DNAT.  This creates a NAT asymmetry and we may end
> up with the wrong destination address.
> 
> By pushing it through FORWARD it will only undergo SNAT which is
> correct since the original packet would have undergone DNAT.

This is only a problem since the recent NAT changes, but I agree
that we should fix it by moving these packets to FORWARD.

Regards
Patrick

  reply	other threads:[~2005-04-27 12:05 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2005-04-25  9:49 Re-routing packets via netfilter (ip_rt_bug) Yair Itzhaki
2005-04-25  9:07 ` Patrick McHardy
2005-04-25 10:52   ` Herbert Xu
2005-04-25 15:28     ` Patrick McHardy
2005-04-25 21:34       ` Herbert Xu
2005-04-26  0:08         ` Patrick McHardy
2005-04-26  0:39           ` Herbert Xu
2005-04-26 13:17             ` Patrick McHardy
2005-04-26 23:28               ` Herbert Xu
2005-04-27  0:56                 ` Patrick McHardy
2005-04-27  1:07                   ` Herbert Xu
2005-04-27 10:26                     ` Patrick McHardy
2005-04-27 10:30                       ` Herbert Xu
2005-04-27 10:41                         ` Jozsef Kadlecsik
2005-04-27 11:35                           ` Herbert Xu
2005-04-27 11:54                             ` Herbert Xu
2005-04-27 12:05                               ` Patrick McHardy [this message]
2017-07-10  9:20 ` Helbing63
2020-07-23  7:25 ` technical support jollyzula
2020-07-23  7:25 ` Canon.com/ijsetup jollyzula
2005-04-25 16:51 Re-routing packets via netfilter (ip_rt_bug) Yair Itzhaki
2005-04-26 15:39 Yair Itzhaki
2005-05-02 17:17 Yair Itzhaki
2005-07-14 12:27 ` Ric Wheeler

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