RFC - 3022

Traditional IP Network Address Translator (Traditional NAT)

Original:	ftp://ftp.isi.edu/in-notes/rfc3022.txt
Authors:	P. Srisuresh [Jasmine Networks], K. Egevang [Intel Corporation]
Date:	January 2001
Category:	Informational

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Obsoletes:
RFC-1631	The IP Network Address Translator (NAT) (Obsoleted by RFC-3022)

Referred by:	21 RFC
Refers to:	11 RFC

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Status

This memo provides information for the Internet community. It does not specify an Internet standard of any kind. Distribution of this memo is unlimited.

Copyright Notice

Copyright (C) The Internet Society (2001). All Rights Reserved.

Abstract

Preface

The NAT operation described in this document extends address translation introduced in RFC 1631(-> 3022) and includes a new type of network address and TCP/UDP port translation. In addition, this document corrects the Checksum adjustment algorithm published in RFC 1631(-> 3022) and attempts to discuss NAT operation and limitations in detail.

Abstract

Basic Network Address Translation or Basic NAT is a method by which IP addresses are mapped from one group to another, transparent to end users. Network Address Port Translation, or NAPT is a method by which many network addresses and their TCP/UDP (Transmission Control Protocol/User Datagram Protocol) ports are translated into a single network address and its TCP/UDP ports. Together, these two operations, referred to as traditional NAT, provide a mechanism to connect a realm with private addresses to an external realm with globally unique registered addresses.

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