> that works, BUT, will that work once ip changes, will that propagate to my
> CNAME...?
>
>

No need to, it will work.

Give it a try (force an IP change, for example reconnect to ADSL) and
the check the result.

Here is a list of commands you may find useful (I'd run these before
and after the IP change):

Check where dydns info coming:
$ host -t ns dyndns.com.
dyndns.com name server ns3.dynamicnetworkservices.net.
dyndns.com name server ns2.dynamicnetworkservices.net.
dyndns.com name server ns1.dynamicnetworkservices.net.
dyndns.com name server ns4.dynamicnetworkservices.net.


Check the current value at the dydns provider:
$ host -t a myhomepc.dyndns.com. ns1.dynamicnetworkservices.net.


Check what Google DNS cache thinks about you:
$ host -t a myhomepc.mydomain.tld. 8.8.8.8
$ host -t a myhomepc.dyndns.com. 8.8.8.8

Cheers,
Miklos
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