Hi,
Check configure example from:
http://www.cisco.com/en/US/docs/ios-xml/ios/ipaddr_dns/configuration/15-1mt/Dynamic_DNS_Support_for_Cisco_IOS_Software.html
HTH,
Lei Tian
ip ddns update method mytest
ddns
http
!Before entering the question mark (?) character in the add http CLI, press the control (Ctrl) key and the v key together on your keyboard. This will allow you to enter the ? without the software interpreting the ? as a help query.
add http://test:test@members.dyndns.org/nic/update?system=dyndns&hostname=&myip=
interval maximum 1 0 0 0
exit
interface ether1
ip ddns update hostname abc.dyndns.org
ip ddns update mytest