IPsec/L2TP VPN question
I've just started to learn about IPsec and VPNs and I think it's very interesting. As I understand there are 2 modes for IPsec. Transport for peer-to-peer connection and Tunnel where you can connected to networks. My question now is, if I have a linux machine with 1 NIC (that is no local network) and I want to be able to connect to it with a windows 2k/xp using VPN. This windows machine is portable (that is the IP changes). Is this possible or must I have a local network for VPN to work ?
Thanks for any reply!