[jeroenhd]

/56 is the smallest they're supposed to allocate for customers, but I've read stories about ISPs providing people with /128s on their CPEs...

A /64 can actually cause problems if you're chaining routers together. In IPv4 that'd give you double NAT which is obviously terrible and not recommended, but in IPv6 that's a fine use case that shouldn't cause any trouble as long as you have the ability to create sufficient subnets. With a /64, you're stuck doing weird stuff with DHCPv6 to get the subnets to work regardless.

[aidenn0]

You don't need double-NAT with ipv4 to chain routers together, just route between different private-allocation subnets. I was running a setup like that to get ethernet access to a part of the house via wifi. Changed it for ipv6 though because my isp only gives me a /64