NAT Port Overlapping

Document Type Expired Internet-Draft (individual in tsv area)
Last updated 2015-10-14 (latest revision 2012-07-16)
Stream IETF
Intended RFC status Informational
Expired & archived
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Stream WG state (None)
Document shepherd No shepherd assigned
IESG IESG state Expired (IESG: Dead)
Consensus Boilerplate Unknown
Telechat date
Responsible AD Wesley Eddy
Send notices to (None)

This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


When network address translation (NAT) is used in an address resource restricted environment, or when a lot of users are located under a NAT device, IP addresses and port resources may be eaten up, and this affects user experiences very negatively. This situation can be greatly mitigated by tweaking mapping behavior and session timer handling in NAT functions. This document proposes extension for optimizing NAT IP address and port resources in address resource restricted environments. The extension enables simultaneous use of a NAT external port for different transport sessions.


Kengo (
Arifumi Matsumoto (

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)