BCP 127 subseries contains 3 RFCs

BCPs are stable identifiers for Best Current Practices. A BCP may consist of a single RFC or a group of RFCs related to a specific IETF process or recommended guidelines.

RFC 4787: BCP 127: Network Address Translation (NAT) Behavioral Requirements for Unicast UDP

Best Current Practice

F. Audet, Ed.
C. Jennings

January 2007
IETF publication
Transport Area

Abstract

This document defines basic terminology for describing different types of Network Address Translation (NAT) behavior when handling Unicast UDP and also defines a set of requirements that would allow many applications, such as multimedia communications or online gaming, to work consistently. Developing NATs that meet this set of requirements will greatly increase the likelihood that these applications will function properly. This document specifies an Internet Best Current Practices for the Internet Community, and requests discussion and suggestions for improvements.

RFC 6888: BCP 127: Common Requirements for Carrier-Grade NATs (CGNs)

Best Current Practice

S. Perreault, Ed.
I. Yamagata
S. Miyakawa
A. Nakagawa
H. Ashida

April 2013
IETF publication
Transport Area

Abstract

This document defines common requirements for Carrier-Grade NATs (CGNs). It updates RFC 4787.

RFC 7857: BCP 127: Updates to Network Address Translation (NAT) Behavioral Requirements

Best Current Practice

R. Penno
S. Perreault
M. Boucadair, Ed.
S. Sivakumar
K. Naito

April 2016
IETF publication
Web and Internet Transport

Abstract

This document clarifies and updates several requirements of RFCs 4787, 5382, and 5508 based on operational and development experience. The focus of this document is Network Address Translation from IPv4 to IPv4 (NAT44). This document updates RFCs 4787, 5382, and 5508.