deny client-updates;       #Assume that some clients will be buggy. Only allow
                           #the DHCP server to do the updates.                              
ddns-hostname = pick (option fqdn.hostname, option host-name,
                       concat ("dhcp-",
                               binary-to-ascii (10, 8, "-", leased-address));
option host-name = config-option server.ddns-hostname;