Our firewall does DHCP and I set the DNS servers to be the two domain controllers.
DNS used to be set to both the domain controllers and to our ISP providers DNS servers. I changed it to only the domain controllers and use forwarders for addresses outside the LAN.
I flushed DNS on workstations and did a release/renew on the network card, rebooted and an ipconfig still shows the isp external DNS servers.
I checked the firewall and it only has internal domain controllers/dns servers listed.
How can I get workstations to only show internal DNS servers in ipconfig?