DynDNS Updates

hostname router1
ip ddns update method dyndns.provider.net
 HTTP
  add http://ddns.provider.net/update.php?user=router1&domain=ddns.provider.net&pass=abc123f&ip=<a>
 interval maximum 0 12 0 0
!
interface Dialer1
 ip ddns update hostname router1.ddns.provider.net
 ip ddns update dyndns.provider.net