Re: nat:REDIRECT on localhost not working in Kernel 2.6

[Jason Opperisano <opie@817west.com>]

On Fri, Nov 19, 2004 at 06:36:02PM +0100, Stephan Uhlmann wrote:
> Hello netfilter friends,
> 
> I want to redirect all connections going to port 80 of a host to port 8080 of 
> 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 
> perfectly fine.
> 
> But I have the problem that locally generated connections are not redirected 
> 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 OUTPUT 
> chain. Instead it seems to go to the POSTROUTING chain. But the REDIRECT 
> target can't be used in the POSTROUTING chain.
> 
> Is this a bug? Is this a feature? Did something change between Kernel 2.4 and 
> 2.6 in this regard?
> 
> I looked through the ChangeLogs and other docs but didn't find any hint.

are all kernels in question compiled with:  IP_NF_NAT_LOCAL

-j

--
"Man, you go through life, you try to be nice to people, you struggle
 to resist the urge to punch 'em in the face, and for what?"
        --The Simpsons