Mechanism for L2TP VPN

This section describes the L2TP VPN tunnel negotiation process and packet encapsulation mechanism.

Mechanism of L2TP VPN in the NAS-Initiated Scenario: This section describes the mechanism of L2TP VPN in the NAS-Initiated scenario in terms of tunnel negotiations, packet encapsulation

Mechanism of L2TP VPN in the Client-Initiated Scenario: This section describes the mechanism of L2TP VPN in the client-initiated scenario in terms of tunnel negotiations, packet encapsulation, and security policies.

Mechanism of L2TP VPN in the Call-LNS Scenario: This section describes the mechanism of L2TP VPN in the Call-LNS scenario in terms of tunnel negotiations, packet encapsulation, security policies, and source NAT on the LAC.