I have a wireless internet connection through a local ISP and we have today added a new VSAT connection to the same border router. All routing is configured to go through the VSAT connection. We are hosting the primary DNS in our premesis and the seconday DNS is hosted in the ISP who is providing us with the wireless connection.
The problem we have is:
When selecting the primary (local) DNS, both DNS and internet traffic flow through the VSAT link and we are facing alot of slowness when browsing to many sites, while some other sites open very quickly (e.g. www.yahoo.com open quickly while as www.cnn.com takes ages to load). On the other hand, when configuring the ISP DNS as the primary DNS, DNS queries flow through the wireless link and internet traffic flows through the VSAT link and all sites open perfectly.
Anyone has any clue about this and does anyone have any suggestions?