Cisco DHCP with Server DNS

[bnelson101]

I have a Cisco 2901 router that I am doing DHCP with on multiple VLANs and a Windows 2012 server that I am running AD and DNS on but for some reason, the DNS is not staying updated. I have the IP of my server configured as the DNS server on all the workstations but still not getting update. The DNS updates when the computer joins the domain and never changes after that. Does anyone have experience with this type of setup?

[Hector Gustavo Serrano Gutierrez]

Hello bnelson101,

As per your description, it does not sound to be a problem with your Cisco Router. Your description is pointing to a problem with the Server.

Your computers should be able to ping the DNS Server.

DNS ports (TCP & UDP 53) should be allowed between computers and DNS Server.

Also, your local DNS Server should be able to send DNS Queries to public DNS Internet Servers and receive a response.

The Cisco 2901 is only providing the IP addressing automatically via DHCP and it sounds it is doing it properly.

Best Regards.