L2TP
Layer 2 Tunneling Protocol (L2TP) is the leading protocol for Layer 2 implementations of VPNs. L2TP is a result of the combination of the L2F and PPTP standards.
L2F
Cisco originally developed L2F as a mechanism for setting up UDP-encapsulated tunnels. At one time, L2F was a popular VPN tunneling protocol in its own right, but lack of grassroots support by Cisco killed it. The public documents on L2F at Cisco’s Web site are limited, and our attempts to bribe a Cisco engineer for more specifics were politely rebuffed.
PPTP
Point-to-Point Tunneling Protocol (PPTP) is Microsoft’s protocol for VPNs. It was designed to provide authenticated and encrypted communications without requiring a public key infrastructure. PPTP uses a TCP connection ...
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