@misc{rfc4925,
    series =    {Request for Comments},
    number =    4925,
    howpublished =  {RFC 4925},
    publisher = {RFC Editor},
    doi =       {10.17487/RFC4925},
    url =       {https://www.rfc-editor.org/info/rfc4925},
    author =    {Xing Li and David Ward and Alain Durand and Spencer Dawkins},
    title =     {{Softwire Problem Statement}},
    pagetotal = 23,
    year =      2007,
    month =     jul,
    abstract =  {This document captures the problem statement for the Softwires Working Group, which is developing standards for the discovery, control, and encapsulation methods for connecting IPv4 networks across IPv6-only networks as well as IPv6 networks across IPv4-only networks. The standards will encourage multiple, inter-operable vendor implementations by identifying, and extending where necessary, existing standard protocols to resolve a selected set of "IPv4/IPv6" and "IPv6/IPv4" transition problems. This document describes the specific problems ("Hubs and Spokes" and "Mesh") that will be solved by the standards developed by the Softwires Working Group. Some requirements (and non-requirements) are also identified to better describe the specific problem scope. This memo provides information for the Internet community.},
}