Native IPv6 behind IPv4-to-IPv4 NAT Customer Premises Equipment (6a44)
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In customer sites having IPv4-only Customer Premises Equipment (CPE),
Teredo (RFC 4380, RFC 5991, RFC 6081) provides last-resort IPv6
connectivity. However, because it is designed to work without the
involvement of Internet Service Providers, it has significant
limitations (connectivity between IPv6 native addresses and Teredo
addresses is uncertain; connectivity between Teredo addresses fails
for some combinations of NAT types). 6a44 is a complementary solution
that, being based on ISP cooperation, avoids these limitations. At the
beginning of 6a44 IPv6 addresses, it replaces the Teredo well-known
prefix, present at the beginning of Teredo IPv6 addresses, with
network-specific /48 prefixes assigned by local ISPs (an evolution
similar to that from 6to4 to 6rd (IPv6 Rapid Deployment on IPv4
Infrastructures)). The specification is expected to be complete enough
for running code to be independently written and the solution to be
incrementally deployed and used. This document defines an Experimental
Protocol for the Internet community.