From mboxrd@z Thu Jan  1 00:00:00 1970
From: Stephan Uhlmann <su@su2.info>
Subject: nat:REDIRECT on localhost not working in Kernel 2.6
Date: Fri, 19 Nov 2004 18:36:02 +0100
Message-ID: <200411191836.07261.su@su2.info>
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Hello netfilter friends,

I want to redirect all connections going to port 80 of a host to port 8080 =
of=20
the same host. Of course I do it with the REDIRECT target:

iptables -t nat -A PREROUTING -p tcp --dport 80 -j REDIRECT --to-ports 8080
iptables -t nat -A OUTPUT -p tcp --dport 80 -j REDIRECT --to-ports 8080

The redirection of externally incoming connections via PREROUTING  works=20
perfectly fine.

But I have the problem that locally generated connections are not redirecte=
d=20
on machines with Linux Kernel 2.6 but on machines with Linux Kernel 2.4.

I tested:
SuSE Linux 9.0 (Kernel 2.4.21, iptables v1.2.8)  - works
SuSE Linux 9.1 (Kernel 2.6.5,  iptables v1.2.9)  - does not work
SuSE Linux 9.2 (Kernel 2.6.8,  iptables v1.2.11) - does not work
Gentoo Linux   (Kernel 2.6.9,  iptables v1.2.11) - does not work

"iptables -t nat -L -v" shows that no packet at all was catched by the OUTP=
UT=20
chain. Instead it seems to go to the POSTROUTING chain. But the REDIRECT=20
target can't be used in the POSTROUTING chain.

Is this a bug? Is this a feature? Did something change between Kernel 2.4 a=
nd=20
2.6 in this regard?

I looked through the ChangeLogs and other docs but didn't find any hint.


Stephan

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