Samba AD DC Port Usage

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Identifying Listening Ports and Interfaces

To identify ports and network interfaces your Samba Active Directory (AD) Domain Controller (DC) is listening on, run:

# netstat -tulpn | egrep "samba|smbd|nmbd|winbind"
tcp        0      0 127.0.0.1:139               0.0.0.0:*                   LISTEN      43270/smbd          
tcp        0      0 10.99.0.1:139               0.0.0.0:*                   LISTEN      43270/smbd          
tcp        0      0 10.99.0.1:88                0.0.0.0:*                   LISTEN      43273/samba         
tcp        0      0 127.0.0.1:88                0.0.0.0:*                   LISTEN      43273/samba         
tcp        0      0 127.0.0.1:445               0.0.0.0:*                   LISTEN      43270/smbd          
tcp        0      0 10.99.0.1:445               0.0.0.0:*                   LISTEN      43270/smbd          
...

The output displays that the services are listening on localhost (127.0.0.1) and the network interface with the IP address 10.99.0.1. On both interfaces, the ports 139/tcp, 88/tcp, and 445/tcp are opened. For further information on the output, see the netstat (8) manual page.

To bind Samba to specific interfaces, see Configure Samba to Bind to Specific Interfaces.



Samba AD DC Port Usage

Service Port Protocol
DNS * 53 tcp/udp
Kerberos 88 tcp/udp
End Point Mapper (DCE/RPC Locator Service) 135 tcp
NetBIOS Name Service 137 udp
NetBIOS Datagram 138 udp
NetBIOS Session 139 tcp
LDAP 389 tcp/udp
SMB over TCP 445 tcp
Kerberos kpasswd 464 tcp/udp
LDAPS ** 636 tcp
Dynamic RPC Ports *** 49152-65535 tcp
Global Catalog 3268 tcp
Global Catalog SSL ** 3269 tcp

* On Samba AD DCs running the Samba internal DNS server.

** If tls enabled = yes (default) is set in your smb.conf file.

*** The range matches the port range used by Windows Server 2008 and later. Samba versions before 4.7 used the TCP ports 1024 to 1300 instead. To manually set the port range in Samba 4.7 and later, set the rpc server port parameter in your smb.conf file. For details, see the parameter description in the smb.conf(5) man page.

Note that other Active Directory (AD) related services that are not provided by Samba, such as ntpd, can open ports on a Domain Controller (DC) as well.