The Generalized TTL Security Mechanism for the Label Distribution Protocol
RFC 6720, “The Generalized TTL Security Mechanism for the Label Distribution Protocol”, is a Proposed Standard document published in August 2012 by C. Pignataro, R. Asati. It updates RFC 5036. It has since been updated by RFC 7552. The canonical text is published by the RFC Editor.
Abstract
The Generalized TTL Security Mechanism (GTSM) describes a generalized use of a packet's Time to Live (TTL) (IPv4) or Hop Limit (IPv6) to verify that the packet was sourced by a node on a connected link, thereby protecting the router\'s IP control plane from CPU utilization-based attacks. This technique improves security and is used by many protocols. This document defines the GTSM use for the Label Distribution Protocol (LDP).
This specification uses a bit reserved in RFC 5036 and therefore updates RFC 5036. [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.
The canonical text of RFC 6720 is hosted at rfc-editor.org. Available in TXT,HTML.
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