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 -plaunt | egrep "ntp|bind|named|samba|?mbd"
tcp        0      0 0.0.0.0:464             0.0.0.0:*               LISTEN      16210/samba
tcp        0      0 10.99.0.1:53            0.0.0.0:*               LISTEN      1544/named
tcp        0      0 127.0.0.1:53            0.0.0.0:*               LISTEN      1544/named
tcp        0      0 0.0.0.0:88              0.0.0.0:*               LISTEN      16210/samba
tcp        0      0 127.0.0.1:953           0.0.0.0:*               LISTEN      1544/named
tcp        0      0 0.0.0.0:636             0.0.0.0:*               LISTEN      9375/samba
tcp        0      0 0.0.0.0:445             0.0.0.0:*               LISTEN      16206/smbd 
tcp        0      0 0.0.0.0:49152           0.0.0.0:*               LISTEN      790/samba
tcp        0      0 0.0.0.0:49153           0.0.0.0:*               LISTEN      16203/samba
tcp        0      0 0.0.0.0:49154           0.0.0.0:*               LISTEN      790/samba
tcp        0      0 0.0.0.0:3268            0.0.0.0:*               LISTEN      9375/samba
tcp        0      0 0.0.0.0:3269            0.0.0.0:*               LISTEN      9375/samba
tcp        0      0 0.0.0.0:389             0.0.0.0:*               LISTEN      16208/samba
tcp        0      0 0.0.0.0:135             0.0.0.0:*               LISTEN      790/samba
tcp        0      0 0.0.0.0:139             0.0.0.0:*               LISTEN      16206/smbd
tcp        0      0 10.99.0.1:49153       10.99.0.75:38714      ESTABLISHED 790/samba
tcp        0      0 10.99.0.1:445         10.99.0.75:40412      ESTABLISHED 721/smbd
tcp        0      0 10.99.0.1:46322       10.99.0.7:1024        ESTABLISHED 16211/samba
tcp        0      0 10.99.0.1:389         10.99.0.88:37116      ESTABLISHED 9375/samba
tcp        0      0 10.99.0.1:49152       10.99.0.7:41890       ESTABLISHED 790/samba
tcp        0      0 10.99.0.1:445         10.99.0.53:41449      ESTABLISHED 5991/smbd
tcp        0      0 10.99.0.1:49153       10.99.0.53:60008      ESTABLISHED 5993/samba
tcp        0      0 10.99.0.1:49152       10.99.0.75:39852      ESTABLISHED 5993/samba
tcp        0      0 10.99.0.1:49152       10.99.0.53:54023      ESTABLISHED 16203/samba
tcp6       0      0 :::464                  :::*                    LISTEN      16210/samba
tcp6       0      0 :::88                   :::*                    LISTEN      16210/samba
tcp6       0      0 ::1:953                 :::*                    LISTEN      1544/named
tcp6       0      0 :::636                  :::*                    LISTEN      9375/samba
tcp6       0      0 :::445                  :::*                    LISTEN      16206/smbd
tcp6       0      0 :::49152                :::*                    LISTEN      790/samba
tcp6       0      0 :::49153                :::*                    LISTEN      790/samba
tcp6       0      0 :::49154                :::*                    LISTEN      790/samba
tcp6       0      0 :::3268                 :::*                    LISTEN      9375/samba
tcp6       0      0 :::3269                 :::*                    LISTEN      9375/samba
tcp6       0      0 :::389                  :::*                    LISTEN      9375/samba
tcp6       0      0 :::135                  :::*                    LISTEN      790/samba
tcp6       0      0 :::139                  :::*                    LISTEN      16206/smbd
udp        0      0 10.99.0.1:389         0.0.0.0:*                           16209/samba
udp        0      0 0.0.0.0:389             0.0.0.0:*                           16209/samba
udp        0      0 10.99.0.1:464         0.0.0.0:*                           16210/samba
udp        0      0 0.0.0.0:464             0.0.0.0:*                           16210/samba
udp        0      0 10.99.0.1:53          0.0.0.0:*                           1544/named
udp        0      0 127.0.0.1:53            0.0.0.0:*                           1544/named
udp        0      0 10.99.0.1:88          0.0.0.0:*                           16210/samba
udp        0      0 0.0.0.0:88              0.0.0.0:*                           16210/samba
udp        0      0 10.99.0.1:123         0.0.0.0:*                           1678/ntpd
udp        0      0 127.0.0.1:123           0.0.0.0:*                           1678/ntpd
udp        0      0 10.99.0.1:137         0.0.0.0:*                           16205/samba
udp        0      0 10.99.0.255:137       0.0.0.0:*                           16205/samba
udp        0      0 0.0.0.0:137             0.0.0.0:*                           16205/samba
udp        0      0 10.99.0.1:138         0.0.0.0:*                           16205/samba
udp        0      0 10.99.0.255:138       0.0.0.0:*                           16205/samba
udp        0      0 0.0.0.0:138             0.0.0.0:*                           16205/samba
udp6       0      0 :::389                  :::*                                16209/samba
udp6       0      0 :::464                  :::*                                16210/samba
udp6       0      0 :::88                   :::*                                16210/samba


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

The samba service, which provides the AD DC features, requires that the following ports are opened on the DC:

Service Port Protocol
DNS * 53 tcp/udp
Kerberos 88 tcp/udp
ntp ** 123 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
Global Catalog 3268 tcp
Global Catalog SSL *** 3269 tcp
Dynamic RPC Ports **** 49152-65535 tcp

* This could be provided by the Samba internal DNS server, or the Bind9 DNS server.

** If ntp is configured and running on the DC.

*** 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.