1:1 stateless NAT is useful for static IPs. Since all your addresses are otherwise global, if you need to switch providers or give up your /64, then you'll need to re-address your static addresses. Instead, you can give your machines static private IPs, and just translate the prefix when going through NAT. It's a lot less horrible than IPv4 NAT since there's no connection tracking needed.

This is something I probably should have done setting up my home Kubernetes cluster. My current IPv6 prefix is from Hurricane Electric, and if my ISP ever gives me a real IPv6 prefix, I will have to delete the entire cluster and recreate it with the new prefix.

[–] Thiakil@aussie.zone 7 points 4 months ago (17 children)

It should only be needed if your ISP is brain-dead and only gives you a /64 instead of what they should be doing and also giving you a /56 or /48 with prefix delegation (I.e it should be getting both a 64 for the wan interface, and a delegation for routing)

You router should be using that prefix and sticking just a /64 on the lan interface which it advertises appropriately (and you can route the others as you please)

Internal ipv6 should be using site-local ipv6, and if they have internet access they would have both addresses.

[–] LaggyKar@programming.dev 2 points 4 months ago* (last edited 4 months ago) (1 children)

64 for the wan interface

Nitpicking, but the address for the wan interface wouldn't have a prefix, so the host would just set it as a /128 (point-to-point)

[–] Thiakil@aussie.zone 1 points 4 months ago

Ehh, I've seen both. Perhaps not in a home router context though, never really bothered to check

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