Hi

I have a Compaq ProLiant server (running Debian 3.1 r2). It's a HTTP and DNS server. The server have 2 NICs:

eth0: 192.168.x.1
eth1: External (and static) IP from my ISP.

Well, I've more servers:
* A FTP server (192.168.x.2)
* A SSH server (192.168.x.3)
* A database server (192.168.x.4)
* A SMTP/POP3 server (192.168.x.5)

At this moment, I need to set the FTP server to public access (like HTTP server) using the same external IP from my ISP.

All server are in different PCs. My question is:

How I can redirect the incoming traffic (FTP request) from Internet to my internal FTP server using Iptables?

I'm using Linux kernel 2.6

Thanks in advance

Miguel

You will want to use the DNAT option. Example is forward ssh port 22 from eth0 to 192.168.69.69 port 22.

/sbin/iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 22 -j DNAT --to-destination 192.168.69.69:22

Brian