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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