Can ddclient be configured in
/etc/ddclient.conf, to send dynamic DNS updates periodically, in addition to when the IP address changes?
Why? Fremium provider dyndns requires an update be made every 30 days, else a free account expires. I switched from AT&T where this was never a problem to a Sonic.net, a more reliable service provider. Now my dynamic IP address is stable for months at a time.