Download the latest verion ddclient-3.7.0. the original .conf has 160 lines and the file should include the following if running in deamon mode:
daemon=300 # check every 300 seconds
and you should include one of the following to get your external IP address if you are connected to a router.
#use=watchguard-soho, fw=192.168.111.1:80 # via Watchguard's SOHO FW
#use=netopia-r910, fw=192.168.111.1:80 # via Netopia R910 FW
#use=smc-barricade, fw=192.168.123.254:80 # via SMC's Barricade FW
My router wasn't listed and I got it through a little trial and error. Followed that with your dyndns member information.
now run test:
ddclient -daemon=0 -debug -verbose -noquiet