You can add DNS server or DNS forwarders to SambaBox in this screen.
Dns Forwarders: This is the DNS address where DNS servers queries records that do not exist in their region.
A query operation works in DNS in the following order:
Zone and host records in DNS are checked.
If no answer is received from here, DNS forwarders are asked.
Queries that DNS forwarders cannot answer are asked to Root Hints.
Root Hints: is the list of DNS Root Server IP addresses found in DNS server.