Question

What does it mean that I have only 15 configurable ipv6 addresses?

On my Freebsd server I see this data for my ipv6 addresses

Public IPv6 Network Public IPv6 Address: 2a03:b0c0:2:d0::xxxx:c001/64 Public IPv6 Gateway: 2a03:b0c0:2:d0::1 Configurable address range: 2a03:b0c0:2:d0::xxxx:c000 - 2a03:b0c0:2:d0::xxxx:c00f

What does the “configurable address range” mean? Can’t I use the complete /64 ?

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Public IPv6 Address: 2a03:b0c0:2:d0::xxxx:c001/64 Public IPv6 Gateway: 2a03:b0c0:2:d0::1 Configurable Address Range: 2a03:b0c0:2:d0::xxxx:c000 - 2a03:b0c0:2:2:d0::xxxx:c00f

So, your current address is 2a03:b0c0:2:2:d0::xxxx:c001/64 because you have 15 possible addresses in the servers assigned configurable address range.

DO give you the ability to assign the addresses to your droplet. You can assign 2a03:b0c0:2:2:d0::xxxx:c002/64 and all the way to 2a03:b0c0:2:2:d0::xxxx:c00f/64.

I wish it were possible to configure all of the addresses to virtually serve the droplet, but this would mean being in control of the switches. You can do floating IP for the droplet, but that does not have the scope for this.

yes, you can.