3 ms·
> But you get your GUAs from your ISP normally, which means if you change your ISP you need to renumber your network. See perhaps "IPv6 Multihoming without Net
by throw0101c 3y ago
> But you get your GUAs from your ISP normally, which means if you change your ISP you need to renumber your network.
See perhaps "IPv6 Multihoming without Network Address Translation":
Network Address and Port Translation (NAPT) works well for conserving
global addresses and addressing multihoming requirements because an
IPv4 NAPT router implements three functions: source address
selection, next-hop resolution, and (optionally) DNS resolution. For
IPv6 hosts, one approach could be the use of IPv6-to-IPv6 Network
Prefix Translation (NPTv6). However, NAT and NPTv6 should be
avoided, if at all possible, to permit transparent end-to-end
connectivity. In this document, we analyze the use cases of
multihoming. We also describe functional requirements and possible
solutions for multihoming without the use of NAT in IPv6 for hosts
and small IPv6 networks that would otherwise be unable to meet
minimum IPv6-allocation criteria. We conclude that DHCPv6-based
solutions are suitable to solve the multihoming issues described in
this document, but NPTv6 may be required as an intermediate solution.
* https://datatracker.ietf.org/doc/html/rfc7157 https://datatracker.ietf.org/doc/html/rfc7157
It is generally discouraged, but recognized that it may be needed. Note that NPTv6 is stateless in its address translating (though not stateless with regards to firewalling and connection tracking).
Also (the long-titled) "Enterprise Multihoming Using Provider-Assigned IPv6 Addresses without Network Prefix Translation: Requirements and Solutions":
* https://datatracker.ietf.org/doc/html/rfc8678 https://datatracker.ietf.org/doc/html/rfc8678