How to configure a linux internet gateway to transmit vpn ..

Archived from groups: comp.dcom.vpn (More info?)

Hello,
I'm french and i apologyze for my poor english...

Here is my problem : I have a computer based on Linux Debian which is
connected to internet by an ethernet adsl modem. This computer is my
gateway to internet. This PC has 2 network card, one for the LAN
(192.168.1.100) and one for the internet connection (its internet IP
Address is dynamic and is provided by no-ip.com).

I have another computer based on Windows 2003 Server which is on my
LAN (192.168.1.200) and which is configured as a VPN Server.

My questions : Can I access to my Windows 2003 Server from internet
(by VPN) ? Am I forced to install freeswan or another VPN software on
my linux gateway, or can I use my gateway to access to my Windows
2003 Server? Must I put my Windows 2003 Server on a direct connection
to internet?

Thank you very much for your answers...

Nicolas