Subject: I-D ACTION:draft-huttunen-ipsec-esp-in-udp-00.txt

From: [email-masked]
Date: Tue, 19 Sep 2000 06:36:12 -0400

A New Internet-Draft is available from the on-line Internet-Drafts directories.

	Title		: ESP Encapsulation in UDP Packets
	Author(s)	: A. Huttunen, J. Sierwald
	Filename	: draft-huttunen-ipsec-esp-in-udp-00.txt
	Pages		: 9
	Date		: 18-Sep-00
	
This document defines a method to encapsulate ESP in UDP, and a method
to negotiate this encapsulation using IKE.
The primary motivation for such encapsulation is to allow ESP traffic 
pass through NATs. However, it is also possible to use it without NATs.
This document defines methods for determining the need for
UDP encapsulation, both in the presence of Basic NAT (i.e. without
port translation) and in the presence of NAPT (with port translation).
This is done by the receiver, based on the information available
in standard IKE packets.
ESPUDP in both tunnel mode and transport mode are defined. Tunnel mode 
ESPUDP through NAT is seen easier to implement, but transport mode ESPUDP can also be made to go through NAT.

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