I am absolutely new in this, and I have something to solve.
I have 2 Linux acting as proxy servers. Each Linux connects two different nets to Internet, so each of them have two nics, with one public and one private IP address.
The fact is: I need to redirect connection attempted to the externalIP and PORT (For example, 18.104.22.168 port 110) to an internal IP (for example 192.168.5.1 port 110)
I think I must use iptables, but MAN is a bit confusing thing to mee yet.
Thanks in advance