dynupdater not seeming to do anything

[Paul Scott]

Can someone please help me diagnose why dynupdater is not seeming to 
update my ip address so I cna access my local computer from somewhere else.

ps ax |grep dyn
   5237 ?        Sl   170:43 dyn_updater
   5269 ?        Sl     5:38 /usr/bin/dyn_updater --daemon start
 719685 pts/2    R+     0:00 grep dyn
TIA.

Paul