dhcpd6.conf

root@gw:/var/dhcpd/etc # cat dhcpd
dhcpd.conf    dhcpdv6.conf  
root@gw:/var/dhcpd/etc # cat dhcpdv6.conf 
option domain-name "home.workaround.org";
option ldap-server code 95 = text;
option domain-search-list code 119 = text;

default-lease-time 7200;
max-lease-time 86400;
log-facility local7;
one-lease-per-client true;
deny duplicates;
ping-check true;
update-conflict-detection false;
authoritative;

subnet6 fd01:ad34:db87:cafe::/64 {
  range6 fd01:ad34:db87:cafe::4200 fd01:ad34:db87:cafe::42ff;
  option dhcp6.name-servers fd01:ad34:db87:cafe::1;
}

ddns-update-style interim;