Port Forwarding

rvfrancisco · 10-01-2003, 11:34 PM

Good Day!

Does anyone knows how to configure port forwarding using iptables in Redhat7.3. My server is using two Lan Card with eth0 with local ip address 192.168.0.3 and eth1 with public ip address. I want to forward port 25 to my mail server 192.168.0.2. Hope anyone here can give me a sample config. THANKS

Regard,
Rodel Francisco
System Administrator

Mara · 10-02-2003, 03:12 PM

Hello,
I've just moved your thread to Linux - Networking. I think it fits better here. member Intro is a good place to say 'hello', but questions should be posted to other forums.

The rule you're searching for is:

Code:

iptables -A PREROUTING -t nat -p tcp -d $EXTIP --dport 25 -j DNAT --to 192.168.0.2:25

where EXTIP is your global IP.

sal_paradise42 · 10-25-2003, 11:28 AM

i have a post somewhere else trying to do the same thing. when
you say global ip that is the public address the one my isp gives me? and if so in what format do I put in there? $193.82.161.30 or with out the $.
thanks

silatts · 10-25-2003, 01:11 PM

w/o the $

the first search on google http://www.netfilter.org/documentati...-tutorial.html

Sil