This option specifies the list of DNS servers that DNS requests will be forwarded to if they can not be handled by Samba itself. The DNS forwarder is only used if the internal DNS server in Samba is used. Port numbers can be appended by separating them from the address by using a colon (':'). When specifying a port, IPv6 addresses must be enclosed in square brackets ('[' and ']'). IPv6 forwarder addresses with no port specified, don't need the square brackets, and default to port 53. 192.168.0.1 192.168.0.2 ::1 [2001:db8::1] [2001:db8:1:2::1]:54