RFC 2661 · PROPOSED STANDARD · 1999
MON · 14 SEP 2026
Layer Two Tunneling Protocol "L2TP"
Overview
RFC 2661, “Layer Two Tunneling Protocol "L2TP"”, is a Proposed Standard document published in August 1999 by W. Townsley, A. Valencia, A. Rubens, G. Pall, G. Zorn, B. Palter. It has since been updated by RFC 9601. The canonical text is published by the RFC Editor.
Abstract
This document describes the Layer Two Tunneling Protocol (L2TP). [STANDARDS-TRACK]
What “Proposed Standard” means
An entry-level standards-track specification: stable, peer-reviewed and a solid basis for implementation, though it may still evolve before becoming an Internet Standard.
Read this RFC
The canonical text of RFC 2661 is hosted at rfc-editor.org. Available in TXT,HTML.
Relationships to other RFCs
Other RFCs from 1999
- RFC 2660 The Secure HyperText Transfer Protocol
- RFC 2662 Definitions of Managed Objects for the ADSL Lines
- RFC 2659 Security Extensions For HTML
- RFC 2663 IP Network Address Translator Terminology and Considerations
- RFC 2658 RTP Payload Format for PureVoice Audio
- RFC 2664 FYI on Questions and Answers - Answers to Commonly Asked "New Internet User" Questions
- RFC 2657 LDAPv2 Client vs
- RFC 2665 Definitions of Managed Objects for the Ethernet-like Interface Types