[C] AFTR implements a Dual-Stack Lite (DS-Lite) Address Family Transition

Router (AFTR)
ISC AFTR implements a Dual-Stack Lite (DS-Lite) Address Family Transition Router (AFTR), as
described in draft-ietf-softwire-dual-stack-lite-06.txt. This technology allows
end-users with IPv4-only hosts or IPv4-only applications to communicate with IPv4 peers over an IPv6-only
network.

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Reference:
The PDF which under aftr-1.1.tar.gz