About DNS

The DNS service manages the resolution of Active Directory internal names. It replaces the NetBios resolution in NT domains.

Ports used by the DNS service

Port

Usage

53

TCP and UDP

Two options are available:

  • Since Samba 4.17, it is recommended to use the hybrid DNS mode with Bind9 for optimal performance and scalability. However, Samba-AD still includes its own internal DNS server, which is fully operational upon installation.

  • For a more advanced or intense use of DNS, the Samba-team advises to use Bind9 as DNS backend (9.8 minimum version).

You may find useful to follow the Bind documentation for Debian and derivatives or Redhat and derivatives.