[rfc-dist] RFC 5879 on Heuristics for Detecting ESP-NULL Packets

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        RFC 5879

        Title:      Heuristics for Detecting ESP-NULL Packets 
        Author:     T. Kivinen, D. McDonald
        Status:     Informational
        Stream:     IETF
        Date:       May 2010
        Mailbox:    kivinen at iki.fi, 
                    danmcd at opensolaris.org
        Pages:      32
        Characters: 72917
        Updates/Obsoletes/SeeAlso:   None

        I-D Tag:    draft-ietf-ipsecme-esp-null-heuristics-07.txt

        URL:        http://www.rfc-editor.org/rfc/rfc5879.txt

This document describes a set of heuristics for distinguishing IPsec
ESP-NULL (Encapsulating Security Payload without encryption) packets
from encrypted ESP packets.  These heuristics can be used on
intermediate devices, like traffic analyzers, and deep-inspection
engines, to quickly decide whether or not a given packet flow is
encrypted, i.e., whether or not it can be inspected.  Use of these
heuristics does not require any changes made on existing IPsec hosts
that are compliant with RFC 4303.  This document is not an Internet 
Standards Track specification; it is published for informational 
purposes.

This document is a product of the IP Security Maintenance and Extensions Working Group of the IETF.


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