[rfc-dist] RFC 3682 on The Generalized TTL Security Mechanism (GTSM)

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Thu, 19 Feb 2004 10:48:51 -0800


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        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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Joyce K. Reynolds and Sandy Ginoza
USC/Information Sciences Institute

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