I maintain a small domain (about 20 clients) and we need to make some changes to the DNS server that's being used by the clients. All the clients have been hard coded to use the domain controller as their DNS. Since these are new machines, and I never changed their DNS settings, I'm guessing there must be a GPO that's causing them to use the domain controller as their DNS. Since we don't have any GPO other than the default one yet, it's got to be the default GPO, however, I have looked through all the GPO settings and none of them refer to anything related to DNS. So I'm wondering if there's anything else that might be causing this.
Any help or advice is highly appreciated.
EDIT: Just to clarify things a little, here's what I'm dealing with: if I look at the network adapter settings in Windows on these clients and check the IPV4 settings, the IP address is set to DHCP, but the DNS is hard coded. I can change the DNS to DHCP also, however, after a reboot, it's back to being hard coded pointing to the domain controller