Configuring the System as a DNS Forwarder
An overview of how to configure the system as a DNS forwarder.
Summary
A forwarder is a server that forwards DNS queries for external DNS names to DNS servers outside of its network. The queries that cannot be resolved locally are forwarded to other DNS servers. Hence, a forwarder accumulates its cache with external DNS information as it resolves all queries to the external DNS queries.
This section provides instructions for the following tasks:
- Configuring Name Servers
- Managing Name Servers
- Configuring Name Servers
The system allows you to add external name servers. This section provides instructions to add a name server, specify DNS lookup, and verify the configuration.
Adding a Name Server
You can add, remove, enable, and disable external name servers. You can create a name server by specifying its IP address or configure an existing virtual server as the name server. To add a name server, use the parameters listed in the following table.
| Parameter |
Description |
|---|---|
| IP Address | Creates an IP address based name server. |
| DNS Virtual Server | Adds an existing virtual server as the name server. |
The following procedure provides the steps for adding a name server.
- In the left pane, expand DNS, then click Name Servers. The Name Servers page appears in the right pane.
- Click Add. The Create Name Server dialog box appears.
- Select the IP Address radio button.
- In the IP Address text box, type IP address based name server. When you are adding an external name server, the Local check box must not be selected.
- Select DNS VirtualServer.
- Click New to create a new load balancing vserver. The Create Virtual Server (Load Balancing) dialog box appears.
- Click Create and then click Close.
When name servers are added in the Forwarder mode, the LOCAL option must be selected. When name servers are added in the End Resolver mode, the LOCAL option must be cleared.
Setting DNS Lookup
You can set the NS lookup to DNS or WINS, use the parameters listed in the following table.
| Parameter | Description |
|---|---|
| Name Lookup Priority | Set the name lookup priority to DNS or WINS |
The following procedure provides the steps to set DNS lookup to DNS or WINS.
- In the left pane, click DNS. The DNS page appears in the right pane.
- Click DNS Parameters. The Configure DNS Parameters dialog box appears.
- In the Name Lookup Priority frame, select WINS or DNS.
- Click OK and then click Close.
Comments (1)
Nov 18
Arun Kumar says:
The statement "When name servers are added in the Forwarder mode, the LOCAL opti...The statement "When name servers are added in the Forwarder mode, the LOCAL option must be selected. When name servers are added in the End Resolver mode, the LOCAL option must be cleared." is wrong. The LOCAL option must be cleared in the Forwarder mode and it must be selected in the End Resolver mode.
Add Comment