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What Ports Does the Samba Client Use?

Ubuntu 13

Samba is an open-source software suite that provides seamless file and print services to SMB/CIFS clients. It allows for interoperability between Linux/Unix servers and Windows-based clients. In this article, we will explore the various ports that a Samba client uses when establishing a connection to an SMB server.

Quick Answer

The Samba client uses a range of ports depending on the type of connection and services being accessed. When running as an Active Directory Domain Controller, it uses ports such as DNS (Port 53), Kerberos (Port 88), and SMB over TCP (Port 445). When running as an NT4 Primary Domain Controller or Member Server, it uses ports such as NetBIOS Name Service (Port 137) and SMB over TCP (Port 445).

Samba Client Port Usage

The Samba client uses various ports depending on the type of connection and the services being accessed. These ports can be categorized based on whether the Samba client is running as an Active Directory Domain Controller or as an NT4 Primary Domain Controller/Member Server.

When Running as an Active Directory Domain Controller

When the Samba client is running as an Active Directory Domain Controller, it uses several ports to communicate with other network services. Here is a detailed breakdown:

  • DNS (Port 53 – TCP/UDP): This port is used for domain name resolution.
  • Kerberos (Port 88 – TCP/UDP): This port is used for authentication and ticket granting.
  • End Point Mapper (DCE/RPC Locator Service) (Port 135 – TCP): This port is used to map network services to their respective ports.
  • NetBIOS Name Service (Port 137 – UDP): This port is used for name registration and resolution.
  • NetBIOS Datagram (Port 138 – UDP): This port is used for connectionless communication.
  • NetBIOS Session (Port 139 – TCP): This port is used for session service.
  • LDAP (Port 389 – TCP/UDP): This port is used for accessing the directory service.
  • SMB over TCP (Port 445 – TCP): This port is used for direct TCP/IP SMB traffic.
  • Kerberos kpasswd (Port 464 – TCP/UDP): This port is used for password changing.
  • LDAPS (Port 636 – TCP): This port is used for secure LDAP connections, but only if “tls enabled = yes”.
  • Dynamic RPC Ports (Range 1024-5000 – TCP): These ports are used for various services that require remote procedure call.
  • Global Catalog (Port 3268 – TCP): This port is used for searching and locating objects in an Active Directory domain.
  • Global Catalog SSL (Port 3269 – TCP): This port is used for secure global catalog traffic, but only if “tls enabled = yes”.
  • Multicast DNS (Port 5353 – TCP/UDP): This port is used for resolving hostnames in a local network.

When Running as an NT4 Primary Domain Controller or a Member Server

When the Samba client is running as an NT4 Primary Domain Controller or a Member Server, it uses the following ports:

  • End Point Mapper (DCE/RPC Locator Service) (Port 135 – TCP): This port is used to map network services to their respective ports.
  • NetBIOS Name Service (Port 137 – UDP): This port is used for name registration and resolution.
  • NetBIOS Datagram (Port 138 – UDP): This port is used for connectionless communication.
  • NetBIOS Session (Port 139 – TCP): This port is used for session service.
  • SMB over TCP (Port 445 – TCP): This port is used for direct TCP/IP SMB traffic.

Conclusion

Understanding the ports that the Samba client uses is crucial for network troubleshooting and for configuring firewalls. It’s important to note that the Samba client will use any of these ports depending on the server it’s connecting to. Once the connection to the SMB server ends, the client ports will no longer listen for incoming connections.

Remember, this information is specific to the Samba client and not the Samba server. For more information about Samba, visit the official Samba documentation.

What is Samba?

Samba is an open-source software suite that provides seamless file and print services to SMB/CIFS clients. It allows for interoperability between Linux/Unix servers and Windows-based clients.

What is the purpose of a Samba client?

The purpose of a Samba client is to enable Linux/Unix servers to communicate with Windows-based clients, allowing for file and print sharing services.

What protocols does the Samba client use?

The Samba client primarily uses the SMB/CIFS (Server Message Block/Common Internet File System) protocols for file and print sharing between Linux/Unix servers and Windows-based clients.

What are the ports used by the Samba client?

The ports used by the Samba client vary depending on the type of connection and the services being accessed. Please refer to the earlier section of this article for a detailed breakdown of the ports used by the Samba client.

Why is it important to know the ports used by the Samba client?

Knowing the ports used by the Samba client is crucial for network troubleshooting and configuring firewalls. Understanding these ports will help ensure proper communication between the Samba client and the SMB server.

Where can I find more information about Samba?

For more information about Samba, you can visit the official Samba documentation at https://www.samba.org/samba/docs/. The documentation provides in-depth information about Samba configuration, usage, and troubleshooting.

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