titan wrote:Hi John,
Thank you for your reply. I think you hit the nail right on the head. I watched the video several times and applied the instructions to my Actiontec C1000A modem. There are two areas, in my modem, to configure the DNS settings. One is under WAN Settings and the other is under DHCP Settings. The DNS works fine if I set it up under either one or both areas. Once I go to Service Blocks and create a rule to block port 53 and apply it to the device's ip address, the device completely stops working instead of routing to the Norton DNS service. I just receive a message "web page cannot be displayed."
I'm not sure if it's an issue with my modem or my lack of understanding. I don't think Centurylink will be very helpful, but I guess it wouldn't hurt to call them or Actiontec for assistance.
Thank you for your help.
Although I'm not personally familiar with the Actiontec C1000A (and whatever firmware variances Centurylink may have implemented), I think I may be able to clear up your dual DNS setting locations observation. The WAN settings are about governing the outside-world interfacing (Wide Area Network - aka, BroadBand) the other setting you found most likely is a part of the LAN (your Local Area Network) side of the modem's integrated router settings. The DHCP (Dynamic Host Configuration Protocol) is a sort of server component who's responsibility it is to allocate IP addresses to your LAN attached devices (both wired and Wi-Fi). Some routers & modem-routers allow the DNS that is used on the LAN side to be independently configured (thereby different) from the WAN DNS utilized by the router's internal services.
As to the Service Block causing BB communication failure - This may be being caused by an in-router firewall rule-precedence (order conflict) - especially if the C1000A router implements a stateful firewall. Unfortunately correcting the problem will require a greater familiarity with the C1000A than I have. However since the modem has the Service Block ability I still think it can be done.
Your best option will be to contact either Centurylink's or better yet, Actiontec's technical support for further assistance. Of course you realize the importance of making the tech support person you contact understand fully the desired outcome you wish to achieve.
If you you do manage to attain a favorable outcome I'd be interested in hearing back from you as to how it was achieved.
Best,
John