I could use some help on our Windows Server 12 Essentials - we keep getting a notice from Charter that we are operating an Open DNS Resolver so I did some research and one solution is to disable recursion on the server but when we do the forwarding is also disabled which in turn doesn't allow clients in the office to access the internet or files on the server. So I re-enabled recursion and of course, everything went back to working. So I looked into disabling port 53 on the router but I can't find anything doing this. We have an Asus RT-N66R and in the DMZ I have the server IP address as listed so certain people in the office can access the router via their home computers or when on the road. If I remove this from the DMZ, then external access to the server isn't available. We have a static IP address from Charter also.
I noticed in the Forwarders section on the server, that the IP address of the router is listed with the FQDN as router.asus.com some I'm not sure completely on why I disable the recursion that everyone's computer loses access to the internet if the router (which everyone is connected to) should be supplying DNS?
Another thing, in the DNS management under the properties for the server, in the "interfaces" tab, the Listen to button for "All IP Adresses" is checked. Should the radio button the IP address for the server be selected?
I've looked through openresolverproject.org for answers or the correct setup that allows the clients to access the internet, server files, the server and be in compliance with charter.
Thank you for all the help you can offer