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How configure Iptable in RedHat 8.0





Hi,
I'm using iptables-1.2.6a-2 in RedHat 8.0 router, gateway and firewall.
I can not configure to implement the case:
Ex:
- External IP of gateway is 203.162.4.1, this host is also listening at
port 80 (Apache WebServer) and portal 8080 (Tomcat).
- Internal IP of gateway is 192.168.2.1
- An other internal host is 192.168.2.2, this host is listening at port
80 (IIS WebServer).

I want a user can go to http://203.162.4.1:81 to access the internal
host 192.168.2.2 that IIS is running.
I have tried to use "PREROUTING" such as

/sbin/iptables -A PREROUTING -t nat -d 203.162.4.1 -p tcp --dport 81 -j
DNAT --to 192.168.2.2:80

(View my configuration iptable in attachment).

but url "http://203.162.4.1:81"; does not work. If I try "REROUTING" to
192.168.2.1 such as:
/sbin/iptables -A PREROUTING -t nat -d 203.162.4.1 -p tcp --dport 81 -j
DNAT --to 192.168.2.1:8080

It's OK. Then, http://203.162.4.1:81 is TomCat HomePage.

What is woring? Please help me!

Thanks!



Attachment: iptable
Description: application/java-applet


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