Comment by fc417fc802
2 days ago
By convention they're supposed to DHCP you at least a /64 if not something wider. I don't believe there's any expectation it be static (although it typically is AFAIK) and there are some providers that defy expectations by handing out narrower slices (up to and including /128).
There's totally expectation of it being static, because why wouldn't it? They cut the ranges up at distribution switches and that's it. We're talking about IPv6 after all. There's absolutely zero benefit to dynamically-allocating ranges for ISP's here, in fact that would make things more complicated, and only serve to add additional load to the routing tables.