Softwires Working Group M. Boucadair, Ed.
Internet-Draft France Telecom
Intended status: Informational S. Matsushima
Expires: May 17, 2013 Softbank Telecom
Y. Lee
Comcast
O. Bonness
Deutsche Telekom
I. Borges
Portugal Telecom
G. Chen
China Mobile
November 13, 2012
Motivations for Carrier-side Stateless IPv4 over IPv6 Migration
Solutions
draft-ietf-softwire-stateless-4v6-motivation-05
Abstract
IPv4 service continuity is one of the most pressing problems that
must be resolved by Service Providers during the IPv6 transition
period - especially after the exhaustion of the public IPv4 address
space. Current standardization effort that addresses IPv4 service
continuity focuses on stateful mechanisms. This document elaborates
on the motivations for the need to undertake a companion effort to
specify stateless IPv4 over IPv6 approaches.
Status of this Memo
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This Internet-Draft will expire on May 17, 2013.
Copyright Notice
Boucadair, et al. Expires May 17, 2013 [Page 1]
Internet-Draft Solution Motivations November 2012
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. Why Stateless IPv4 over IPv6 Solutions are Needed? . . . . . . 4
3.1. Network Architecture Simplification . . . . . . . . . . . 4
3.1.1. Network Dimensioning . . . . . . . . . . . . . . . . . 4
3.1.2. No Intra-domain Constraint . . . . . . . . . . . . . . 5
3.1.3. Logging - No Need for Dynamic Binding Notifications . 5
3.1.4. No Additional Protocol for Port Control is Required . 5
3.2. Operational Tasks and Network Maintenance Efficiency . . . 6
3.2.1. Preserve Current Practices . . . . . . . . . . . . . . 6
3.2.2. Planned Maintenance Operations . . . . . . . . . . . . 6
3.2.3. Reliability and Robustness . . . . . . . . . . . . . . 6
3.2.4. Support of Multi-Vendor Redundancy . . . . . . . . . . 6
3.2.5. Simplification of Qualification Procedures . . . . . . 7
3.3. Facilitating Service Evolution . . . . . . . . . . . . . . 7
3.3.1. Implicit Host Identification . . . . . . . . . . . . . 7
3.3.2. No Organizational Impact . . . . . . . . . . . . . . . 8
3.4. Cost Minimization Opportunities . . . . . . . . . . . . . 8
4. Discussion . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.1. Dependency Between IPv4 and IPv6 Address Assignments . . . 10
4.2. IPv4 Port Utilisation Efficiency . . . . . . . . . . . . . 10
4.3. IPv4 Port Randomization . . . . . . . . . . . . . . . . . 11
5. Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . . 11
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