Protocol 47 and Port Forwarding
I am new to Linux. There is a machine on my network running as a gateway. It uses IP Chains, and port forwarding is on.
I want to set up a VPN -- I have the software all ready to go, and mostly tested. The only thing left for me to do is forward the port for external IP addresses to be redirected to the VPN's IP address.
From what I've read, my VPN server runs on port 1723. I've entered a command in IPchains (this is an old Linux box) to forward port 1723 to IP address 192.168.1.120 (the VPN server).
Now, I'm not even sure if that worked.
How would I, in IPChains, set up port forwarding to my VPN server? I want only those ports necessary for a Windows XP Pro VPN server to be accessible to the outside world (hence, the VPN).
I also read something about making sure protocol 47 is enabled or forwarded to the VPN server. I'm not sure what that is supposed to mean.
Can anyone shed some light on my dark situation? I'm in need of some serious help!