The Generalized TTL Security Mechanism (GTSM)
RFC 5082

Approval announcement
Draft of message to be sent after approval:

From: The IESG <>
To: IETF-Announce <>
Cc: Internet Architecture Board <>,
    RFC Editor <>
Subject: Protocol Action: 'The Generalized TTL Security 
         Mechanism (GTSM)' to Proposed Standard 

The IESG has approved the following document:

- 'The Generalized TTL Security Mechanism (GTSM) '
   <draft-ietf-rtgwg-rfc3682bis-11.txt> as a Proposed Standard

This document is the product of the Routing Area Working Group. 

The IESG contact persons are Ross Callon and David Ward.

A URL of this Internet-Draft is:

Technical Summary
  The use of a packet's Time to Live (TTL) (IPv4) or Hop Limit (IPv6)
  to verify whether the packet was originated by an adjacent node on a
  connected link has been used in many recent protocols.  This document
  generalizes this technique.  This document obsoletes RFC 3682.

Working Group Summary
  No dissent reported. This document defines an easy-to-deploy 
  (ie easy to configure) and computationally simple / efficient 
  mechanism which might be considered to be less robust than 
  cryptographic authentication techniques, and as such there is 
  inevitably some difference of opinion regarding how valuable 
  this is. On many platforms this technique is computationally 
  significantly more efficient than cryptographic authentication 
  methods, and therefore may be more effective against DOS attacks. 
Protocol Quality
  Ross Callon has reviewed this spec for the IESG. This document 
  updates an experimental RFC that is implemented and widely deployed.

RFC Editor's Note:

  The last sentence of section 4 is not actually a sentence. It 
  currently reads:

    During and after the IETF Last Call, Francis Dupont, Sam
    Hartman, Lars Eggert, and Ross Callon.

  This should be changed to be:

    During and after the IETF last call, useful comments were 
    provided by Francis Dupont, Sam Hartman, Lars Eggert, and Ross