The IESG has approved the following document: - 'The Generalized TTL Security Mechanism (GTSM) for Label Distribution Protocol (LDP)' (draft-ietf-mpls-ldp-gtsm-09.txt) as Proposed Standard This document is the product of the Multiprotocol Label Switching Working Group. The IESG contact persons are Adrian Farrel and Stewart Bryant. A URL of this Internet Draft is: http://datatracker.ietf.org/doc/draft-ietf-mpls-ldp-gtsm/ Technical Summary The Generalized TTL Security Mechanism (GTSM) describes a generalized use of a packets 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. Working Group Summary This document has been through a pretty normal working group process, with no discontent and strong support. The document was last called in the MPLS working group, and information about this last call was copied to the rtgwg. Document Quality We know of plans to implement this specification. A request was sent to the MPLS working mailing list for further information and there were indications from vendors that this will be implemnted. Since this is based on RFC 5082 and LDP is a pretty straightforward protocol the review process has not led to any major changes in the document. One of the co-authors of this document is also a co-author of RFC 5082. LDP was also highlighted in RFC 5082 as one of the potential protocols that the would benefite from a GTSM mechanis. The AD review prior to IETF last call led to a number of minor updates, and a Routing Directorate review by Eric Gray during IETF last call led to a further revision. Personnel Loa Andersson (loa@pi.nu) is the document shepherd Adrian Farrel (adrian@olddog.co.uk) is the Responsible AD
