# set ddns-hostname if exists host-name { ddns-hostname = lcase(option host-name); } elsif exists fqdn.hostname { ddns-hostname = lcase(option fqdn.hostname); } else { # "2001:20a0:4000:300::123" would produce "300-0-0-0-123" as the ddns-hostname ddns-hostname = binary-to-ascii(16, 16, "-", suffix(substring(option dhcp6.ia-na, 16, 16), 10)); }