Skip to content
Last update: 2022-04-26

Configure DNS servers

DNS settings are in: Network > DNS.

There are three ways to assign DNS servers to Sophos Firewall;

  • From your DHCP server.
  • From PPPoE interface settings sent by your internet provider.
  • Manually, by assigning static server entries.


    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.

The first two settings just require you to select the appropriate radio button.

Assigning DNS servers automatically

To assign DNS servers manually, do as follows:

  1. Go to Network > DNS.
  2. Select Static DNS.

    Configure static DNS servers

  3. In DNS 1, enter the IP address of the server you wish to use as your primary DNS server.

  4. Optionally, in DNS 2, enter the IP address of a secondary DNS server.
  5. Optionally, in DNS 3, enter the IP address of a tertiary DNS server.
  6. Click Apply.
Back to top