For DHCPv6 PD, the following commands exist:
set service dhcpv6-server shared-network-name <name> subnet <prefix> prefix-delegation prefix <pd-prefix> prefix-length <length> set service dhcpv6-server shared-network-name <name> subnet <prefix> prefix-delegation prefix <pd-prefix> delegated-length <length>
The VyOS CLI limits the prefix-length from 32 to 64, and the delegated length from 32 to 96.
The underlying kea DHCPv6 server however does not have that limitation, it supports values from 1 to 128, as long as delegated-prefix is not smaller than the prefix length.
Why is this artificial limit introduced and can it be lifted. I have a situation where subnets use a /112 prefix, on which I can not configure SLAAC at the moment.