Chapter 5. Troubleshooting L2TPv3 Based VPNs
The Layer Two Tunneling Protocol Version 3 (L2TPv3) is described in Internet Draft draft-ietf-l2tpext-l2tp-base. L2TPv3 provides a mechanism for tunneling Layer 2 frames such as PPP, HDLC, Frame Relay, and Ethernet over a packet-switched network. This is a key enhancement over L2TPv2 (as described in RFC 2661), which allows only the tunneling of PPP frames.
Internet Draft draft-ietf-l2tpext-l2tp-base discusses three L2TPv3 tunneling models:
An L2TP Access Concentrator (LAC) to L2TP Network Server (LNS) tunneling model
An LNS to LNS tunneling model
A LAC to LAC tunneling model
The LAC to LNS tunneling model (also described in RFC 2661) allows the tunneling of frames from a remote access client or system ...
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