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Status:

INFORMATIONAL

Authors:

C. Donley, Ed.
L. Howard
V. Kuarsingh
J. Berg
J. Doshi

Stream:

INDEPENDENT

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DOI:  https://doi.org/10.17487/RFC7021

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Abstract

NAT444 is an IPv4 extension technology being considered by ServiceProviders as a means to continue offering IPv4 service to customerswhile transitioning to IPv6. This technology adds an extra Carrier-Grade NAT (CGN) in the Service Provider network, often resulting intwo NATs. CableLabs, Time Warner Cable, and Rogers Communicationsindependently tested the impacts of NAT444 on many popular Internetservices using a variety of test scenarios, network topologies, andvendor equipment. This document identifies areas where adding asecond layer of NAT disrupts the communication channel for commonInternet applications. This document was updated to include theDual-Stack Lite (DS-Lite) impacts also.

For the definition ofStatus,seeRFC 2026.

For the definition ofStream, seeRFC 8729.