Suppose you run your own internal DNS server, this server could be used as an alternate server to resolve DNS queries for a domain you do not want to be resolved by DNS forwarders. On the Network Services > DNS > Request Routing tab you can define routes to your own DNS servers.
To create a DNS request route, proceed as follows:
On the Request Routing tab, click New DNS Request Route.
The Add DNS Request Route dialog box opens.
Specify the following settings:
Domain: Enter the domain for which you want to use an alternate DNS server.
Target servers: Select or add one or more DNS servers to use for resolving the domain entered above. For how to add a network definition, see Definitions & Users > Network Definitions > Network Definitions.
Comment (optional): Add a description or other information.
The new route appears on the DNS Request Route list and is immediately active.
To either edit or delete a DNS request route, click the corresponding buttons.