I have a working Pi-hole docker-base installation in the IPv4 space (which is what I am using).
I am taking the opportunity to set up IPv6. The interfaces have IP, for instance
root@srv ~ # ip addr show dev enp3s0
2: enp3s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
link/ether 40:8d:5c:4b:aa:55 brd ff:ff:ff:ff:ff:ff
inet 192.168.10.2/24 brd 192.168.10.255 scope global enp3s0
valid_lft forever preferred_lft forever
inet6 2a01:XXX:XXXX:XXXX:XXXX:XXXX:XXXX:XXXX/64 scope global dynamic mngtmpaddr noprefixroute
valid_lft 86255sec preferred_lft 86255sec
inet6 fe80::428d:5cff:fe4b:aa55/64 scope link proto kernel_ll
valid_lft forever preferred_lft forever
My Pi-hole is warning me that
no address range available for DHCPv6 request via enp3s0
What is the general direction I should be looking at? (so not specifically a solution, but rather the concepts this warning addresses (except that this is related to DHCP and IPv6 )
For reference, the documentation: