DNS Request Routing is where an alternate DNS server is used during the DNS resolution process. The following sections are covered:
Applies to the following Sophos products and versions Sophos Firewall
If you want domain names to be resolved through an alternate DNS server rather than Forwarders or Root Servers, then you can configure DNS request route for that server. If a cache lookup fails, the DNS query will not get forwarded to Forwarders or Root Servers and will get routed to the target servers added in the request route entry.
The best use of this feature is when you have configured internal DNS servers and want external DNS names to be resolved by them. For these domain names, you can add routes to the internal DNS Servers. This will decrease the Internet traffic over the network and speed up DNS Client requests, as queries will not be forwarded outside the network.
Set the Sophos Firewall to act as a DNS server.
Go to Network > DNS and click Add under DNS Request Route. Enter the following parameters:
Enter the domain for which you want to use an internal DNS Server.
Select the DNS Servers to resolve the domain you entered above.
A maximum of eight IP Addresses can be added.
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