https://mailarchive.ietf.org/arch/msg/softwires/G9Qd8mUgvyP_d-9SvYCyTX8Tn9c/
[Softwires] Host 4over6
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https://datatracker.ietf.org/doc/html/draft-cui-softwire-host-4over6-06
draft-cui-softwire-host-4over6-06
Public IPv4 over Access IPv6 Network (Internet-Draft, 2011)
draftcuisoftwirehost