the effects of IPSEC encryption & fragmented packets on network sensors papers

From: abiola abimbola (cmsaabim@livjm.ac.uk)
Date: 08/16/02 

Date: 16 Aug 2002 20:03:24 -0000
From: abiola abimbola <cmsaabim@livjm.ac.uk>
To: focus-ids@securityfocus.com
('binary' encoding is not supported, stored as-is)

Are their any published papers on the effect and probable solution to
IPSec encryption and fragmented packets on network sensors. I know of
Ptacek, Thomas H.&Newsham, Tomothy N. Insertion, Evasion, and Denial Of
Service: Eluding Network Intrusion Detection but is there any other.Can
you help.