Thanks for your help. I will try to do it in the server. Is there any document that should read about this? Barry Brimer wrote: >> Yes. >> >> I plan to use centos as the OS on the gateway server. >> >> >> Barry Brimer wrote: >>> So you're trying to determine what you need to do to forward >>> connections from your system to port 5555 on the remote system via >>> your gateway it seems. What is your gateway running? Is it running >>> CentOS? > > I would use something like: > > iptables -t nat -I PREROUTING -d <public ip address of server> -p tcp > --dport 5555 -j DNAT --to <private IP address of database server> > > If you are not already masquerading traffic out, this should handle that. > "iptables -t nat -A POSTROUTING -s <internal network/mask> -j MASQUERADE" > > > Once you see that work, you can do a "service iptables save" to save the > configuration and "chkconfig iptables on" to make sure it starts on boot. > > Barry