A new Request for Comments is now available in online RFC libraries.
RFC 3682
Title: The Generalized TTL Security Mechanism (GTSM)
Author(s): V. Gill, J. Heasley, D. Meyer
Status: Experimental
Date: February 2004
Mailbox: vijay@umbc.edu, heas@shrubbery.net, dmm@1-4-5.net
Pages: 11
Characters: 23321
Updates/Obsoletes/SeeAlso: None
I-D Tag: draft-gill-gtsh-04.txt
URL: ftp://ftp.rfc-editor.org/in-notes/rfc3682.txt
The use of a packet's Time to Live (TTL) (IPv4) or Hop Limit (IPv6) to
protect a protocol stack from CPU-utilization based attacks has been
proposed in many settings (see for example, RFC 2461). This document
generalizes these techniques for use by other protocols such as BGP
(RFC 1771), Multicast Source Discovery Protocol (MSDP), Bidirectional
Forwarding Detection, and Label Distribution Protocol (LDP) (RFC
3036). While the Generalized TTL Security Mechanism (GTSM) is most
effective in protecting directly connected protocol peers, it can also
provide a lower level of protection to multi-hop sessions. GTSM is
not directly applicable to protocols employing flooding mechanisms
(e.g., multicast), and use of multi-hop GTSM should be considered on a
case-by-case basis.
This memo defines an Experimental Protocol for the Internet community.
It does not specify an Internet standard of any kind. Discussion and
suggestions for improvement are requested. Distribution of this memo
is unlimited.
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USC/Information Sciences Institute
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