VPN (Wikipedia)
Protocols:
PPTP (Point-to-Point Tunneling Protocol): PPTP uses a control channel over TCP and a GRE tunnel operating to encapsulate PPP packets.
L2TP (Layer 2 Tunneling Protocol): The entire L2TP packet, including payload and L2TP header, is sent within a UDP datagram.
OpenVPN (Wikipedia)
http://openmaniak.com/openvpn.php
With a VPN home computer IP is not seen, VPN server's IP is.
Client side:
- VPN appears to the IP level network code as a normal network device
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