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RFC 8880
Title: Special Use Domain Name 'ipv4only.arpa'
Author: S. Cheshire,
D. Schinazi
Status: Standards Track
Stream: IETF
Date: August 2020
Mailbox: [email protected],
[email protected]
Pages: 17
Updates: RFC 7050
I-D Tag: draft-cheshire-sudn-ipv4only-dot-arpa-17.txt
URL: https://www.rfc-editor.org/info/rfc8880
DOI: 10.17487/RFC8880
NAT64 (Network Address and Protocol Translation from IPv6 Clients to
IPv4 Servers) allows client devices using IPv6 to communicate with
servers that have only IPv4 connectivity.
The specification for how a client discovers its local network's
NAT64 prefix (RFC 7050) defines the special name 'ipv4only.arpa' for
this purpose. However, in its Domain Name Reservation Considerations
section (Section 8.1), that specification (RFC 7050) indicates that
the name actually has no particularly special properties that would
require special handling.
Consequently, despite the well-articulated special purpose of the
name, 'ipv4only.arpa' was not recorded in the Special-Use Domain
Names registry as a name with special properties.
This document updates RFC 7050. It describes the special treatment
required and formally declares the special properties of the name. It
also adds similar declarations for the corresponding reverse mapping
names.
This is now a Proposed Standard.
STANDARDS TRACK: This document specifies an Internet Standards Track
protocol for the Internet community, and requests discussion and suggestions
for improvements. Please refer to the current edition of the Official
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