Is SMB port 139 TCP or UDP?

The earlier version of SMB (SMB 1.0) was originally designed to operate on NetBIOS over TCP/IP

NetBIOS over TCP/IP

NetBIOS over TCP/IP (NBT, or sometimes NetBT) is a networking protocol that allows legacy computer applications relying on the NetBIOS API to be used on modern TCP/IP networks. NetBIOS was developed in the early 1980s, targeting very small networks (about a dozen computers).

https://en.wikipedia.org › wiki › NetBIOS_over_TCP

NetBIOS over TCP/IP - Wikipedia

(NBT), which uses port TCP 139 for session services, port TCP/UDP 137 for name services, and port UDP 138 for datagram services.

Does SMB use TCP or UDP?

SMB relies on the TCP and IP protocols for transport. This combination potentially allows file sharing over complex, interconnected networks, including the public Internet. The SMB server component uses TCP port 445.

Is port 139 needed for SMB?

SMB has always been a network file sharing protocol. As such, SMB requires network ports on a computer or server to enable communication to other systems. SMB uses either IP port 139 or 445.

Which TCP port does SMB use?

It's a transport layer protocol designed to use in Windows operating systems over a network. Port 445 is used by newer versions of SMB (after Windows 2000) on top of a TCP stack, allowing SMB to communicate over the Internet.

Does SMB require UDP?

Windows supports file and printer-sharing traffic by using the SMB protocol directly hosted on TCP. SMB 1.0 and older CIFS traffic supported the NetBIOS over TCP (NBT) protocol supported the UDP transport, but starting in Windows Vista and Windows Server 2008 with SMB 2.0. 2, requires TCP/IP over port 445.

What is an SMB Port? What is Port 445 and Port 139 used for?

What is TCP 139 used for?

Port 139 is utilized by NetBIOS Session service. Enabling NetBIOS services provide access to shared resources like files and printers not only to your network computers but also to anyone across the internet.

Is NetBIOS UDP or TCP?

The protocols in the NetBIOS over TCP/IP suite implements the NetBIOS services atop TCP and UDP, which is described in RFC 1001 and RFC 1002. NetBIOS over TCP/IP (also called NBT) seems to slowly supersede all the other NetBIOS variants.

Is port 445 TCP or UDP?

TCP port 445 is used for direct TCP/IP MS Networking access without the need for a NetBIOS layer. This service is only implemented in the more recent verions Windows starting with Windows 2000 and Windows XP. The SMB (Server Message Block) protocol is used among other things for file sharing in Windows NT/2K/XP.

What protocol commonly operates on port 139 TCP on Windows based systems?

For instance, on Windows, SMB can run directly over TCP/IP without the need for NetBIOS over TCP/IP. This will use, as you point out, port 445. On other systems, you'll find services and applications using port 139. This means that SMB is running with NetBIOS over TCP/IP.

Does SMB use NetBIOS?

SMB does rely on NetBIOS for communication with devices that do not support direct hosting of SMB over TCP/IP. NetBIOS is completely independent from SMB. It is an API that SMB, and other technologies can use, so NetBIOS has no dependency to SMB.

What are ports 137 and 138 used for?

Ports 137, 138, and 139 are used by NetBIOS, which does not support IPv6. CIFS is required for Windows file service. You can disable CIFS by issuing the cifs terminate command on your storage system console.

Does SMB use NetBIOS or DNS?

The default is NetBIOS. Many SMB clients have configuration options to enable NetBIOS over TCP/IP, SMB directly over TCP/IP, or both.

Is SMB routable?

It depends on some aspects of the protocols and implementations. NetBIOS/NetBEUI is not routable at all and it works sending broadcasts. Workgroups, domain joining, browsing, hostname update and other features of the SMB suite will be restricted to your network due those limitations.

What is NetBIOS UDP?

NetBIOS Name Service

Description: UDP NetBIOS name query packets are sent to this port, usually of Windows machines but also of any other system running Samba (SMB), to ask the receiving machine to disclose and return its current set of NetBIOS names.

What type of protocol is SMB Tryhackme?

The SMB protocol is known as a response-request protocol, meaning that it transmits multiple messages between the client and server to establish a connection. Clients connect to servers using TCP/IP (actually NetBIOS over TCP/IP as specified in RFC1001 and RFC1002), NetBEUI or IPX/SPX.

How do I open port 139 on Windows?

What is SMB access?

The Server Message Block (SMB) protocol is a network file sharing protocol that allows applications on a computer to read and write to files and to request services from server programs in a computer network. The SMB protocol can be used on top of its TCP/IP protocol or other network protocols.

What is TCP 135 used for?

TCP port 135 is the Remote Procedure Call (RPC) Endpoint Mapper service. It enables other systems to identify what services are available on a machine and on which port they can be found. Essentially it allows a system unfettered access to a target system.

What is the difference between SMB and SAMBA?

SAMBA was originally SMB Server – but the name had to be changed due to SMB Server being an actual product. SMB was the predecessor to CIFS. SMB (Server Message Block) and CIFS (Common Internet File System) are protocols. Samba implements CIFS network protocol.

How do I find my SMB port number?

There are multiple ways to check if SMB port is open on a windows system. Open the command prompt and run the following commands and filter the port number ( 445 in this example) to see the status.