DynDNS Setup
you will have to press ctrl+v then ? to add the question mark Tested
ip ddns update method DynDNS
HTTP
add http://username:password@members.dyndns.org/nic/update?system=dyndns&hostname=<h>&myip=<a>
interval maximum 0 1 0 0
interval minimum 0 1 0 0
!
hostname host
!
ip domain name dyndns.org
ip name-server 4.2.2.2
!
interface FastEthernet4
ip ddns update hostname host.dyndns.org
ip ddns update DynDNS