Skip to content
Last update: 2022-07-06

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.
  • 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.

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.

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 want to use as the 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