[IPv6 6rd Tunnel] Subnetting IPv6 the non-standard way

[samip537]

My ISP is Telia, and I'm using these settings in IPv6:

I have a /56 prefix, so I would want to give one subnet of it to Docker containers running on a virtual machine and seperate subnet for the rest of my LAN.

How would I get this done on the router? I would rather use the router for this than a separate virtual machine.

P.S I don't think you're supposed to split a /56, but I might be mistaken.

 

[samip537]

UPDATE: I just had to pop on to IRC to ask people as I got no reply here.

This is the IPv6 prefix the router get's from DHCP. I had to tweak that prefix part a little so it would only advertise the prefix I wanted for the LAN and not the entire given prefix which was way too big.