Sunday 24 June 2012

Explain concept of Virtual Private Networks


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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