I think I'm almost there. DynuDDNS is updating the DNS records properly, and timely. But I'd like to take it one step further by enabling my modem to dynamically update the DDNS records whenever our IP changes.

I've attached three files which explain the issue. I simply don't know what to enter in the fields for the requirements of the CX4000xg modem. It's furnished by CenturyLink. Anyone have any experience with this modem your willing to share?

I've added to more PDF's which show what settings the CX4000xg would like for me to supply.

CTL suggested I use my user name to log into THEIR system, which to me make so sense.