Configure DNS servers
You can assign DNS servers to Sophos Firewall in the following ways:
- From your DHCP server.
- From PPPoE interface settings sent by your internet provider.
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Manually, by assigning static server entries.
Note
The firewall queries DNS servers in the listed order until it receives a response. For example, it queries the second server only if it doesn't receive a response from the first server within the time-out period.
It considers an NXDOMAIN (domain doesn't exist) response valid and won't query the next server.
To assign DNS servers to Sophos Firewall using a DHCP server or PPPoE interface settings, go to Network > DNS, select either Obtain DNS from DHCP or Obtain DNS from PPPoE, and click Apply.
To assign DNS servers manually, do as follows:
- Go to Network > DNS.
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Select Static DNS.
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In DNS 1, enter the IP address of the server you want to use as the primary DNS server.
- Optionally, in DNS 2, enter the IP address of a secondary DNS server.
- Optionally, in DNS 3, enter the IP address of a tertiary DNS server.
- Click Apply.