DNS forwarders

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

Open [DNS] window, select DNS server and Click [Properties]

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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