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

Revision differences

Document history

Date By Action
2026-05-20
(System)
Changed metadata: changed keywords to '['address sharing', 'IPv4 service continuity', 'Carrier Grade NAT', 'CGN', 'LSN', 'NAT traversal', 'RFC4787', 'RFC5382', 'RFC5508', 'DS-Lite', 'NAT64', 'Address depletion']' from …
Changed metadata: changed keywords to '['address sharing', 'IPv4 service continuity', 'Carrier Grade NAT', 'CGN', 'LSN', 'NAT traversal', 'RFC4787', 'RFC5382', 'RFC5508', 'DS-Lite', 'NAT64', 'Address depletion']' from '[]'
2026-05-20
(System) Metadata update from RFC Editor
2026-05-20
(System) Changed author "K. Naito": changed name from "Kengo Naito" to "K. Naito", cleared country (was "Japan"), changed order from "4" to "5"
2026-05-20
(System) Changed author "S. Sivakumar": changed name from "Senthil Sivakumar" to "S. Sivakumar", cleared country (was "United States"), changed order from "3" to "4"
2026-05-20
(System)
Changed author "M. Boucadair": changed name from "Mohamed Boucadair" to "M. Boucadair", changed is_editor from "False" to "True", cleared country (was "France"), changed order from …
Changed author "M. Boucadair": changed name from "Mohamed Boucadair" to "M. Boucadair", changed is_editor from "False" to "True", cleared country (was "France"), changed order from "2" to "3"
2026-05-20
(System) Changed author "S. Perreault": changed name from "Simon Perreault" to "S. Perreault", cleared country (was "Canada"), changed order from "1" to "2"
2026-05-20
(System) Changed author "R. Penno": changed name from "Reinaldo Penno" to "R. Penno", cleared country (was "United States"), changed order from "0" to "1"
2026-05-20
(System) Metadata update from RFC Editor
2023-12-12
(System) Imported membership of rfc7857 in bcp127 via sync to the rfc-index
2023-12-12
(System) No history of BCP127 is currently available in the datatracker before this point
2018-12-20
(System)
Received changes through RFC Editor sync (changed abstract to 'This document clarifies and updates several requirements of RFCs 4787, 5382, and 5508 based on operational …
Received changes through RFC Editor sync (changed abstract to '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.')
2016-04-28
(System) RFC published