option domain-name "example.com";
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;
authoritative;
subnet6 2600:1234:5678:90ab::/64 {
        range6 2600:1234:5678:90ab::1000 2600:1234:5678:90ab::2000;
        do-forward-updates false;
        option dhcp6.name-servers 2600:1234:5678:90ab::1;

}

ddns-update-style interim;
ddns-dual-stack-mixed-mode true;
update-conflict-detection true;
update-optimization false;
deny client-updates;
ddns-domainname "example.com.";
ddns-hostname=pick(option fqdn.hostname, concat("dyn-",binary-to-ascii(16,16,"-",substring(option dhcp6.ia-na, 16, 16))));

zone example.com. {
        primary 127.0.0.1;
}