specify source port on NAT

Jorge Davila davila at nicaraguaopensource.com
Fri Jun 29 18:57:22 CEST 2007

 From http://iptables-tutorial.frozentux.net/

An example:

iptables -t nat -A POSTROUTING -p tcp -o eth0 -j SNAT --to-source

Best regards,

Jorge Dávila.

Snow Wolf wrote:
> hello members,
> My client has a strange requirement.When I made a nat firewall with
> iptables for him,he need the forwarded package's source port was not
> changed,or changed to a specified port which he can control.
> For example,
>  --->   iptables(nat)  ---> www.aol.com
> (sport: 1234)          (sport: 1234)       (dport:80)
> He need that when a package was left from iptables,the source port was
> still 1234.
> (or something like 1235 is also ok,but he need to control it,it means
> he can descide which port is the source port from iptables.)
> How to do it?thanks.

Jorge Isaac Davila Lopez
Nicaragua Open Source
+505 430 5462
davila at nicaraguaopensource.com

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