How can I have all subdomains automatically redirected to the DynDNS IP address?

To redirect all subdomains automatically to the DynDNS IP address, you can simply create a wildcard (*) as CNAME entry, which points to the hostname of the DynDNS. This can be useful if you want to work with a reverse proxy in your network. As hostname for the DynDNS account you can use the main domain as well as a subdomain.