Virtual Domains DynDns.org Update

Hi,

I have a domain from DynDns.org as my primary domain and each time my Ip changes it gets updated. It also updates it each month and so I don't get any reminder e-mails to keep it active.

I have another domain from DynDns.org setup as a virtualdomain pointing to an ibay but this does not update each month and I get reminder e-mails. I've tried to edit the update-dns script and run it but this doesn't work. I added a few extra lines that do the same as the primary domain but I've hard coded the virtualdomain.

In /var/log/messages I get:
Oct 26 19:00:23 tuxx dyndns.org: IP Address 82.36.132.96 already in database.
Oct 26 19:04:35 tuxx dyndns.org: IP Address 82.36.132.96 already in database.

My guess would be that SME is detecting that the address is the same and so not updating it, but what happens every month then?

I've found the following post but I can't really make sense of it and it only seems to be for updating the virtualdomains and I want to update my primary and virtual domain.
http://forums.contribs.org/index.php?topic=1977.msg6590#msg6590

If any one can point me in the right direction this would help.

Thanks

Craig