NPTv6 Multihoming on:
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IPv6-to-IPv6 Network Prefix Translation (NPTv6) is a specification for 
NPTv6 differs from NAT66, which is stateful.
With NPTv6, no port translation is required nor other manipulation of transport characteristics.
Compared to NAT66, with NPTv6 there is end-to-end reachability along with 1:1 address mapping.
This makes NPTv6 a better choice than NAT66.
Cisco documentation on NPTv6
APNIC blog post from 2018 on NAT66
IPv6 Network address translation {{network-stub
IPv6
Internet Protocol version 6 (IPv6) is the most recent version of the Internet Protocol (IP), the communication protocol, communications protocol that provides an identification and location system for computers on networks and routes traffic ...
to achieve address-independence at the network edge, similar to network address translation (NAT) in Internet Protocol version 4
Internet Protocol version 4 (IPv4) is the fourth version of the Internet Protocol (IP). It is one of the core protocols of standards-based internetworking methods in the Internet and other packet-switched networks. IPv4 was the first version de ...
(IPv4). It has fewer architectural problems than traditional IPv4 NAT; for example, it is stateless and preserves the reachability attributed to the end-to-end principle
The end-to-end principle is a design framework in computer networking. In networks designed according to this principle, guaranteeing certain application-specific features, such as reliability and security, requires that they reside in the commu ...
. However, the method may not translate embedded IPv6 addresses properly (IPsec
In computing, Internet Protocol Security (IPsec) is a secure network protocol suite that authenticates and encrypts packets of data to provide secure encrypted communication between two computers over an Internet Protocol network. It is used in ...
can be impacted), and split-horizon DNS
In computer networking, split-horizon DNS (also known as split-view DNS, split-brain DNS, or split DNS) is the facility of a Domain Name System (DNS) implementation to provide different sets of DNS information, usually selected by the source addre ...
may be required for use in a business environment.
NPTv6 differs from NAT66, which is stateful.
With NPTv6, no port translation is required nor other manipulation of transport characteristics.
Compared to NAT66, with NPTv6 there is end-to-end reachability along with 1:1 address mapping.
This makes NPTv6 a better choice than NAT66.
References
External links
Cisco documentation on NPTv6
APNIC blog post from 2018 on NAT66
IPv6 Network address translation {{network-stub