This post was split from the "Home Server" tutorial in the Tutorials section. Plese refer there.

On DynDNS I see no "Dynamic host" option, only:

Credited Account (?) No
Technical Support
Account Upgrades (?)
MailHop Outbound (?)
Recursive DNS (?)
DNS Service Level Agreement (?)

I think it's Recursive DNS, but I'm not sure. Which one is it?

Otherwise, this is a useful guide.

Login to dyndns (with your free account you created)
On the yellow bar in the site choose "Services"

Now you'll see following menu , and you can add DYNDNS host:
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DNS Services

* Custom DNS - Our flagship DNS management tool for your own domain
* Secondary DNS - Add reliability to your own nameservers
* Recursive DNS - Ensure DNS resolution for your DNS queries
* Dynamic DNS - A free DNS service for those with dynamic IP addresses
* Static DNS - A free DNS service for those with static IP addresses
* TLD DNS - DNS for operators of ccTLDs and gTLDs
---------------------------------------------

Hope this could help.
:wink: