Canonical URL:
https://www.rfc-editor.org/bcp/bcp127.txt

Cite this BCP: TXT

BCP 127 contains the following RFCs:
NumberFilesTitleAuthorsDateMore InfoStatus
RFC 4787, BCP 127ASCII, PDFNetwork Address Translation (NAT) Behavioral Requirements for Unicast UDPF. Audet, Ed., C. JenningsJanuary 2007Updated by RFC 6888, RFC 7857Best Current Practice
RFC 6888, BCP 127ASCII, PDFCommon Requirements for Carrier-Grade NATs (CGNs)S. Perreault, Ed., I. Yamagata, S. Miyakawa, A. Nakagawa, H. AshidaApril 2013Updates RFC 4787Best Current Practice
RFC 7857, BCP 127ASCII, PDFUpdates to Network Address Translation (NAT) Behavioral RequirementsR. Penno, S. Perreault, M. Boucadair, Ed., S. Sivakumar, K. NaitoApril 2016Updates RFC 4787, RFC 5382, RFC 5508Best Current Practice

Abstract of RFC 4787

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.

Abstract of RFC 6888

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

Abstract of RFC 7857

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.


For the definition of Status, see RFC 2026.

For the definition of Stream, see RFC 4844.


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