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Title : IPv6 - IPv4 Translators (NAT64) - Problem Statement and Analysis
Author(s) : M. Bagnulo
Filename : draft-bagnulo-v6ops-6man-nat64-pb-statement-00.txt
Pages : 9
Date : 2007-11-13
RFC 4966 published on July 2007 deprecates the NAT-PT tool, the
mechanism defined by the IETF to enable communications between IPv4
only nodes with IPv6 only nodes, letting the dual-stack approach as
the preferred mechanism to enable nodes to be able to communicate
with v6 and v4 nodes. However, there are several reasons why the
dual stack approach may not be adequate for a number of scenarios.
For once, the dual-stack approach imposes the management of two
networks in a site, the v6 one and the v4 one, increasing the costs
of using IPv6. In addition, as IPv4 public address space is
depleted, it will no longer possible to access to IPv4 public
addresses, making dual stack nodes even less attractive. It is then
considered necessary to explore alternative mechanisms that enable
communication of v6 nodes and v4 nodes, other than the deprecated
NAT-PT. In order to do that, the first that is needed is to
understand what capabilities are required and what constrains affect
the design space. The goal of this document is to state the
different capabilities that can be required to IPv4 - IPv6
translators (hereafter called NAT64) and the constraints that affect
the solution space.
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