udp portforward on same interface

udp portforward on same interface

[Amir Zangeneh]

[-- Attachment #1: Type: text/plain, Size: 330 bytes --]

Hi

I'm using iptables as a firewall system and I'm very pleased. But I'm trying to make a rule which forwards a udp port to another on the same interface.. I want users who connect to port 78 be redirected to port 98.. Is it possible to do this with iptables? If yes.. Could someone give me an example.. thank you..


Amir

[-- Attachment #2: Type: text/html, Size: 937 bytes --]

Re: udp portforward on same interface

[Patrick McHardy]

This doesn't belong on netfilter-devel as it's clearly a user question which
can even be easily answered by looking at the manpage.

Example:
iptables -t nat -A PREROUTING -i <if> -p udp --dport 78 -j REDIRECT 
--to-ports 98
iptables -A INPUT -i <if> -p tcp --dport 98 -j ACCEPT

Bye
Patrick

Amir Zangeneh wrote:

> Hi
>  
> I'm using iptables as a firewall system and I'm very pleased. But I'm 
> trying to make a rule which forwards a udp port to another on the same 
> interface.. I want users who connect to port 78 be redirected to port 
> 98.. Is it possible to do this with iptables? If yes.. Could someone 
> give me an example.. thank you..
>  
>  
> Amir

Re: udp portforward on same interface

[Sven Schuster]

Hello,

first of all this is the the netfilter developing mailing list, maybe
you try the users mailing list next time?? ;-)

What you want to do can easily be done with the REDIRECT
target. Try something like

iptables -t nat -A PREROUTING -p udp --dport 78 -j REDIRECT --to-ports 98

Hope this helps ;-)

Sven


Amir Zangeneh wrote:

> Hi
>  
> I'm using iptables as a firewall system and I'm very pleased. But I'm 
> trying to make a rule which forwards a udp port to another on the same 
> interface.. I want users who connect to port 78 be redirected to port 
> 98.. Is it possible to do this with iptables? If yes.. Could someone 
> give me an example.. thank you..
>  
>  
> Amir

Re: udp portforward on same interface

[Sven Schuster]

Uhhh, and don't forget to ACCEPT traffic for UDP port 98
in filter table INPUT

Sven



Amir Zangeneh wrote:

> Hi
>  
> I'm using iptables as a firewall system and I'm very pleased. But I'm 
> trying to make a rule which forwards a udp port to another on the same 
> interface.. I want users who connect to port 78 be redirected to port 
> 98.. Is it possible to do this with iptables? If yes.. Could someone 
> give me an example.. thank you..
>  
>  
> Amir