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Virtual Private Networks (VPN) - page 14 / 21

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http://sce.uhcl.edu/yang/teaching/.../VPN.ppt

14

Layer 2 Tunneling Protocol (L2TP)

An example of network layer VPN: use IP packets to encapsulate Layer 2 frames

RFCs:

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RFC2661 Layer Two Tunneling Protocol L2TP W. Townsley, A. Valencia, A. Rubens, G. Pall, G. Zorn, B. Palter. August 1999 (PROPOSED STANDARD)

a standard method for tunneling Point-to-Point Protocol (PPP) [RFC1661] sessions.

L2TP has since been adopted for tunneling a number of other L2 protocols (e.g., Ethernet, Frame Relay, etc).

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RFC3931 Layer Two Tunneling Protocol - Version 3 (L2TPv3) J. Lau, Ed., M. Townsley, Ed., I. Goyret, Ed. March 2005 (PROPOSED STANDARD)

L2TPv3 defines the base control protocol and encapsulation for tunneling multiple Layer 2 connections between two IP nodes.

L2TPv3 consists of

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the control protocol for dynamic creation, maintenance, and teardown of L2TP sessions, and

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the L2TP data encapsulation to multiplex and demultiplex L2 data streams between two L2TP nodes across an IP network.

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