port forwarding on loopback device

Hi,

I want to forward a port bellow 1024 (let's say 889) to port above
1024 (8080),
all this on loopback device. Is that possible ? I've tried :

sudo iptables -t nat -A PREROUTING -p tcp --dport 889 -i lo -j
REDIRECT --to-port 8080

On 808 I've got a tomcat running, than I've tried to telnet to
127.0.0.1 on 889
an I get
Trying 127.0.0.1...
telnet: Unable to connect to remote host: Connection refused

What am I doing wrong ?

On Wed, 06 Jun 2007 08:23:32 +0000, thomas.fazekas wrote:

> Hi,
>
> I want to forward a port bellow 1024 (let's say 889) to port above
> 1024 (8080),
> all this on loopback device. Is that possible ? I've tried :
>
> sudo iptables -t nat -A PREROUTING -p tcp --dport 889 -i lo -j
> REDIRECT --to-port 8080
>
> On 808 I've got a tomcat running, than I've tried to telnet to
> 127.0.0.1 on 889
> an I get
> Trying 127.0.0.1...
> telnet: Unable to connect to remote host: Connection refused
>
> What am I doing wrong ?

http://iptables.rlworkman.net/chunkyhtml/x4529.html


--

Regards
Robert

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(E-Mail Removed) wrote:
> Hi,
>
> I want to forward a port bellow 1024 (let's say 889) to port above
> 1024 (8080),
> all this on loopback device. Is that possible ? I've tried :
>
> sudo iptables -t nat -A PREROUTING -p tcp --dport 889 -i lo -j
> REDIRECT --to-port 8080
>
> On 808 I've got a tomcat running, than I've tried to telnet to
> 127.0.0.1 on 889
> an I get
> Trying 127.0.0.1...
> telnet: Unable to connect to remote host: Connection refused
>
> What am I doing wrong ?
>

For port forwarding on lo, you need to use
the OUTPUT chain instead of PREROUTING.

--

Tauno Voipio
tauno voipio (at) iki fi