Assessing the Impact of Carrier-Grade NAT on Network Applications
RFC 7021
Document | Type |
RFC - Informational
(September 2013; No errata)
Was draft-donley-nat444-impacts (individual)
|
|
---|---|---|---|
Authors | Chris Donley , Lee Howard , Victor Kuarsingh , John Berg , Jinesh Doshi | ||
Last updated | 2013-09-19 | ||
Stream | Independent Submission | ||
Formats | plain text html pdf htmlized (tools) htmlized bibtex | ||
IETF conflict review | conflict-review-donley-nat444-impacts | ||
Stream | ISE state | Published RFC | |
Consensus Boilerplate | Unknown | ||
Document shepherd | No shepherd assigned | ||
IESG | IESG state | RFC 7021 (Informational) | |
Telechat date | |||
Responsible AD | (None) | ||
Send notices to | rfc-ise@rfc-editor.org |
Independent Submission C. Donley, Ed. Request for Comments: 7021 CableLabs Category: Informational L. Howard ISSN: 2070-1721 Time Warner Cable V. Kuarsingh Rogers Communications J. Berg CableLabs J. Doshi Juniper Networks September 2013 Assessing the Impact of Carrier-Grade NAT on Network Applications Abstract NAT444 is an IPv4 extension technology being considered by Service Providers as a means to continue offering IPv4 service to customers while transitioning to IPv6. This technology adds an extra Carrier- Grade NAT (CGN) in the Service Provider network, often resulting in two NATs. CableLabs, Time Warner Cable, and Rogers Communications independently tested the impacts of NAT444 on many popular Internet services using a variety of test scenarios, network topologies, and vendor equipment. This document identifies areas where adding a second layer of NAT disrupts the communication channel for common Internet applications. This document was updated to include the Dual-Stack Lite (DS-Lite) impacts also. Status of This Memo This document is not an Internet Standards Track specification; it is published for informational purposes. This is a contribution to the RFC Series, independently of any other RFC stream. The RFC Editor has chosen to publish this document at its discretion and makes no statement about its value for implementation or deployment. Documents approved for publication by the RFC Editor are not a candidate for any level of Internet Standard; see Section 2 of RFC 5741. Information about the current status of this document, any errata, and how to provide feedback on it may be obtained at http://www.rfc-editor.org/info/rfc7021. Donley, et al. Informational [Page 1] RFC 7021 NAT444 Impacts September 2013 Copyright Notice Copyright (c) 2013 IETF Trust and the persons identified as the document authors. All rights reserved. This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents (http://trustee.ietf.org/license-info) in effect on the date of publication of this document. Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Donley, et al. Informational [Page 2] RFC 7021 NAT444 Impacts September 2013 Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 4 2. Testing Scope . . . . . . . . . . . . . . . . . . . . . . . . 5 2.1. Test Cases . . . . . . . . . . . . . . . . . . . . . . . . 5 2.1.1. Case 1: Single Client, Single Home Network, Single Service Provider . . . . . . . . . . . . . . . . . . . 5 2.1.2. Case 2: Two Clients, Single Home Network, Single Service Provider . . . . . . . . . . . . . . . . . . . 6 2.1.3. Case 3: Two Clients, Two Home Networks, Single Service Provider . . . . . . . . . . . . . . . . . . . 7 2.1.4. Case 4: Two Clients, Two Home Networks, Two Service Providers Cross ISP . . . . . . . . . . . . . 8 2.2. General Test Environment . . . . . . . . . . . . . . . . . 8 2.3. Test Metrics . . . . . . . . . . . . . . . . . . . . . . . 10 2.4. Test Scenarios Executed . . . . . . . . . . . . . . . . . 11 2.5. General Test Methodologies . . . . . . . . . . . . . . . . 11 3. Observed CGN Impacts . . . . . . . . . . . . . . . . . . . . . 12 3.1. Dropped Services . . . . . . . . . . . . . . . . . . . . . 13 3.2. Performance Impacted Services . . . . . . . . . . . . . . 14 3.3. Improvements since 2010 . . . . . . . . . . . . . . . . . 15 3.4. Additional CGN Challenges . . . . . . . . . . . . . . . . 16 4. 2011 Summary of Results . . . . . . . . . . . . . . . . . . . 17 4.1. NAT444 . . . . . . . . . . . . . . . . . . . . . . . . . . 17 4.2. DS-Lite . . . . . . . . . . . . . . . . . . . . . . . . . 19 5. 2010 Summary of Results . . . . . . . . . . . . . . . . . . . 22 5.1. Case 1: Single Client, Single Home Network, Single Service Provider . . . . . . . . . . . . . . . . . . . . . 22 5.2. Case 2: Two Clients, Single Home Network, SingleShow full document text