Samba Domain Member Port Usage: Difference between revisions

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= Identifying Listening Ports and Interfaces =
= Introduction =


⚫
To identify ports and network interfaces your Samba domain member is listening on, run:
If you require to secure your Samba installation with a firewall, you would need information, what ports and protocols are used. This page will give you an overview.





⚫
= Identify on which ports and interfaces Samba is listening =

You can use "netstat" to identify which ports Samba and related daemons are listening on and on which IPs:


# netstat -tulpn | egrep "smbd|nmbd|winbind"
# netstat -tulpn | egrep "smbd|nmbd|winbind"

The following is a snippet of an example output:

tcp 0 0 127.0.0.1:139 0.0.0.0:* LISTEN 43270/smbd
tcp 0 0 127.0.0.1:139 0.0.0.0:* LISTEN 43270/smbd
tcp 0 0 10.0.0.1:139 0.0.0.0:* LISTEN 43270/smbd
tcp 0 0 10.99.0.1:139 0.0.0.0:* LISTEN 43270/smbd
tcp 0 0 127.0.0.1:445 0.0.0.0:* LISTEN 43270/smbd
tcp 0 0 127.0.0.1:445 0.0.0.0:* LISTEN 43270/smbd
tcp 0 0 10.0.0.1:445 0.0.0.0:* LISTEN 43270/smbd
tcp 0 0 10.99.0.1:445 0.0.0.0:* LISTEN 43270/smbd
.....
...


The above example shows, that the services are listening on localhost (127.0.0.1) and the interface with IP 10.0.0.1 - each on the listed ports (139, 445,...).
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 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|Configure Samba to Bind to Specific Interfaces]].








= Port usage when Samba runs as a Member Server =
= Samba Domain Member Port Usage =


{| border="1"
{| class="wikitable"
!Service
!Service
!Port
!Port
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|tcp
|tcp
|}
|}





= Prevent Samba from listening on all interfaces =

Sometimes you don't want Samba to listen on all interfaces of your host. For example, when the host is directly connected to the internet, you surely don't want to provide your shares to the rest of the world. If you limit Samba to listen only on the internal NIC(s), you don't need a firewall to prevent access from the outside.

Add the following to the "[global]" section of your smb.conf to bind Samba to eth0 and loopback:

bind interfaces only = yes
interfaces = lo eth0

The "interfaces" parameter allows various ways to restrict. See the manpage for more details.

After the changes, restart Samba.

Revision as of 00:20, 27 August 2016

Identifying Listening Ports and Interfaces

To identify ports and network interfaces your Samba domain member is listening on, run: 

# netstat -tulpn | egrep "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      0 127.0.0.1:445               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 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 Domain Member Port Usage

Service Port protocol
End Point Mapper (DCE/RPC Locator Service) 135 tcp
NetBIOS Name Service 137 udp
NetBIOS Datagram 138 udp
NetBIOS Session 139 tcp
SMB over TCP 445 tcp
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