I've come across a problem recently in that my Zywall 110 only has a max of 10 DDNS entries
Ive been slowly moving my domains over from www.Noip.com to http://domains.google as they come up for renewal but Google domains uses Dynamic DNS (eg dyndns2 protocol).
You would think finding a windows update client would be easy right....?
Nope - they are all either scripts you can update dynamic dns urls from a bat file etc or are for unix/Linux installations or a lot of android versions (....im assuming so you can browse to your phone via ip to do updates).
Ugh for some reason the exact solution I was looking for was hidden away after 1 hour of google searching / links etc DynSite - http://noeld.com/dynsite.asp
Supports a ton of providers located at http://noeld.com/services.htm
Supports a ton of routers for obtaining networked ip address - http://noeld.com/routers.htm
(not the Zywall 110....but it can obtain ip address with a websearch)
Took me a bit to work out the configuration (my dumb mistake....) see below, but this windows client does exactly what I need so hopefully with some SEO magic this link will help someone else out find DynSite - http://noeld.com/dynsite.asp faster.