I have installed a fresh copy of ClearOS 5.1 and everything is working fine: DHCP, roaming profiles, share drives. Except for the DNS.
I have added various dns entries for example: intranet.domain.local, nas.domain.local to point to point to two different ip addresses.
The problem is that sometimes the dns works from the workstations and points to the corresponding ip address when I type the nas (i.e. intranet or nas) and sometimes it goes to a google search.
I think the DNS server is timing out quickly that sometimes it doesn't allow the local DNS to lookup in its cache, hence it hits the next external dns server.
How can I solve this problem? Prolong the DNS query time to the local DNS server. Clearly, the local dns must always function when a local server is being lookup/requested?