How can I do simple port forwarding on RH9?
 

Machine A is the internet gateway (1 pub IP and 1 private IP) and i am running iptable on it now and it is working ok. I want all internet visit to machine A port 80 would automatically forward to machine B with private IP (it would be a web server). so... what should i do ? :confused: :confused: :confused: please help, many thanks~~

iptables -t nat -A PREROUTING -j DNAT -s ! LAN --dport 80 --to VIRTUALHOST

where lan is your local area network ip subnet
ex:
machine ips like 192.168.1.13 etc
LAN would be, 192.168.1.0/255.255.255.0
machine ips like 10.1.0.116 etc
LAN would be, 10.1.0.0/255.0.0.0

and VIRTUALHOST is the ip:80 of the virtual host
ex:
192.168.1.116:80

hi hakcenter and all, sorry, i forget to tell that the pub IP is dynamic, so......... anythings i should do it again? thanks.... :)

actually no, i wrote that to support dhcp wan.

it preroutes anyone that is not on your subnet to that ip

Something similar to this I've never been able to figure out is how to do this without NAT. More precisely how to re-direct a port to another machine in the same subnet.

For instance all access to port 3306(mysql) on 204.204.204.204 redirected to port 3307 on 204.204.204.205 or something like that. I can never seem to get this to work with iptables but can get more straightforward things like your example to work. Any ideas or suggestions?