I-D Action:draft-ietf-ipsecme-traffic-visibility-12.txt

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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the IP Security Maintenance and Extensions Working Group of the IETF.


	Title           : Wrapped ESP for Traffic Visibility
	Author(s)       : K. Grewal, et al.
	Filename        : draft-ietf-ipsecme-traffic-visibility-12.txt
	Pages           : 15
	Date            : 2010-01-20

This document describes the Wrapped Encapsulating Security 
Payload (WESP) protocol, which builds on the Encapsulating 
Security Payload (ESP) [RFC4303], and is designed to allow 
intermediate devices to (1) ascertain if data confidentiality is 
being employed within ESP and if not, (2) inspect the IPsec 
packets for network monitoring and access control functions.  
Currently in the IPsec ESP standard, there is no deterministic 
way to differentiate between encrypted and unencrypted payloads 
by simply examining a packet. This poses certain challenges to 
the intermediate devices that need to deep inspect the packet 
before making a decision on what should be done with that packet 
(Inspect and/or Allow/Drop). The mechanism described in this 
document can be used to easily disambiguate integrity-only ESP 
from ESP-encrypted packets, without compromising on the security 
provided by ESP.

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