What happened to my dns server?

Question

Domain Name System

There was a problem, all pages are loaded for a very long time, the Internet barely works, I feel that there is a problem with dns. The network scheme is as follows (users-> domain controller (with dns server)-> pfsense-> Internet) pings are normal, how to understand what is going on, any suggestions!

Answer 1

Slow page loading and DNS are very weakly related. Sounds doubtful.

Answer 2

Start with nslookup ya.ru х.х.х.х , where х.х.х.х is the IP of your DNS server

Answer 3

1. ipconfig /all on the client machine where the problem occurs.
We find out the list of all received DNS servers . We
test them for availability and passing the request (as well as the response speed) - as Alexander Karabanov
ordered. On domain machines, client DNS should only look at domain controllers.
2. We look at the DNS server on the domain controller:
- logs with server errors\warnings
- availability of DNS servers specified in the network connection properties of the domain controller and passing a request to them from the domain controller
- DNS settings:
availability of root hints
availability of forwarders and air conditioning forwarders, if you have specified them in the server properties.
3. Efficiency and absence of errors in the Active Directory service.

Answer 4

made a "loop" with a patch cord or traffic routing.