Using forwarders
DNS servers can be configured to send all recursive queries to a selected list of servers, known as forwarders. Servers used in the list of forwarders provide recursive lookup for any queries that a DNS server receives that it cannot answer based on its local zones. During the forwarding process, a DNS server configured to use forwarders (either one or more servers, based upon the forwarders list) essentially behaves as a DNS client to its forwarders.
Benefits of using forwarders
Forwarders are often desirable when access to remote DNS servers requires use of a slow link, such as a fast-speed internal network linked to the Internet over a relatively low-speed connection. Using forwarders in this situation can cut down on expensive traffic over the low-speed link in two ways:
Sample Network
ISP DNS servsers
Master DNS server 202.144.129.34 Slave DNS server1 202.144.129.33 Slabe DNS server2 202.144.128.200
Configure DNS forwarders
1. Open [DNS] window, select DNS server and Click [Properties]
2. Select [Forwarders] tab, click [Enable forwarders] and add ISP DNS servers.
Notice: If you cannot enable forwarders, you need to delete [ . ] forward Lookup Zone and restart the server
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