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) : M. Bhatia, K. Grewal, G. Montenegro
Filename : draft-ietf-ipsecme-traffic-visibility-02.txt
Pages : 12
Date : 2009-4-30
This document describes the Wrapped Encapsulating Security
Payload (WESP) protocol, which builds on top of ESP [RFC4303]
and is designed to allow intermediate devices to ascertain if
ESP-NULL is being employed and hence inspect the IPsec packets
for network monitoring and access control functions. Currently
in the IPsec standard, there is no way to differentiate between
ESP encryption and ESP NULL encryption 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 ESP-NULL from ESP encrypted packets,
without compromising on the security provided by ESP.
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