The Generalized TTL Security Mechanism (GTSM)
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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) ' 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: http://www.ietf.org/internet-drafts/draft-ietf-rtgwg-rfc3682bis-11.txt
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 Callon.