I found this on DynDNS http://www.dyndns.com/support/kb/record_types.html#cnameanchor I don't know much about CNAME.. sorry.
Just out of curiosity, why would you want to do that?![]()
http://freedns.afraid.org/
I've got home.mydomain.com > me.homeserver.com > my IP
Think that is what your after.