I have an odd issue. Recently we had a huge network install, this install subsequently moved our previous network from a flat /16 network to multiple VLAN's and subnets all on a /24. Our DNS server (also PDC) was the primary dns for the network started to act oddly after we changed the subnet information both in the NIC and AD Sites & Services (I added the 10.25.0.0/24 range). Now we have an odd issue of not being able to resolve as quickly as we did before the change over. The major change was changing the subnet of the DC. Does anyone know if I need to add the entire VLAN structure into AD S&S, or is there some sort of DNS issue at large? Any help would be appreciated.
PS. Google DNS is setup in the forwarders, and The DNS server resolves just fine, the clients do not.