[v4tov6transition] IPv4 Residual Deployment across IPv6-Service networks (4rd)
Rémi Després <remi.despres@free.fr> Tue, 19 October 2010 07:31 UTC
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From: Rémi Després <remi.despres@free.fr>
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Date: Tue, 19 Oct 2010 09:32:03 +0200
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Subject: [v4tov6transition] IPv4 Residual Deployment across IPv6-Service networks (4rd)
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Hi, all, FYI, the new draft on 4rd has jus been posted. It is available at tools.ietf.org/html/draft-despres-softwire-4rd-00. Comments most welcome. RD Internet Engineering Task Force R. Despres Internet-Draft RD-IPtech Intended status: Standards Track October 18, 2010 Expires: April 21, 2011 IPv4 Residual Deployment across IPv6-Service networks (4rd) A NAT-less solution draft-despres-softwire-4rd-00 Abstract During the long transition period from IPv4-only to IPv6-only, networks will have not only to deploy the IPv6 service but also to maintain some IPv4 connectivity for a number of customers, and this for both outgoing and incoming connections and for both customer- individual and shared IPv4 addresses. The 4rd solution (IPv4 Residual Deployment) is designed as a lightweight solution for this. It applies not only to ISPs have IPv6-only routing networks, but also to those that, during early transition stages, have IPv4-only routing, with 6rd to offer the IPv6 service, those that have dual- stack routing networks but with private IPv4 addresses assigned to customers. In some scenarios, 4rd can dispense ISPs from supporting any NAT in their infrastructures. In some others it can be used in parallel with NAT-based solutions such as DS-lite and/or NAT64/DNS4 which achieve better IPv4-address sharing ratios (but at a price of significantly higher operational complexity). ... Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3 2. Definitions . . . . . . . . . . . . . . . . . . . . . . . . . 4 3. Applicability . . . . . . . . . . . . . . . . . . . . . . . . 5 4. The 4rd Protocol Specification . . . . . . . . . . . . . . . . 8 4.1. Mapping Rules . . . . . . . . . . . . . . . . . . . . . . 8 4.2. Packet Encapsulations/Decapsulations . . . . . . . . . . . 9 4.3. Port sets of IPv4r prefixes longer than /32 . . . . . . . 10 4.4. PMTU Considerations . . . . . . . . . . . . . . . . . . . 12 4.5. Parameter Acquisitions by 4rd Clients . . . . . . . . . . 12 5. Example with IPv6-only Routing and Shared IPv4 Addresses . . . 14 6. Security considerations . . . . . . . . . . . . . . . . . . . 16 7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 17 8. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 17 9. References . . . . . . . . . . . . . . . . . . . . . . . . . . 17 9.1. Normative References . . . . . . . . . . . . . . . . . . . 17 9.2. Informative References . . . . . . . . . . . . . . . . . . 18 Author's Address . . . . . . . . . . . . . . . . . . . . . . . . . 18
- [v4tov6transition] IPv4 Residual Deployment acros… Rémi Després