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What is SMB over NetBIOS?

What is SMB over NetBIOS?

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. Port 139: SMB originally ran on top of NetBIOS using port 139. NetBIOS is an older transport layer that allows Windows computers to talk to each other on the same network.

Why would an attacker scan for port 445?

Ports 139 and 445 are used for ‘NetBIOS’ communication between two Windows 2000 hosts. In the case of port 445 an attacker may use this to perform NetBIOS attacks as it would on port 139.

What is port 445 used for and what is its a security risk and why?

Port 445 is associated with SMB (Service Message Block), an application layer network protocol that is mostly used for file sharing, printer sharing, and serial port sharing. Port 445 is vulnerable to security assaults, according to security researchers, and should be deactivated.

What port is NetBIOS?

Port 139
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.

Why is NetBIOS still used?

NetBIOS (Network Basic Input/Output System) was created in the early 1980’s, but is surprisingly still alive and well on many networks today. Microsoft Windows still uses it for its name resolution function (often by default), when DNS is not available.

What is NetBIOS needed for?

NetBIOS is used for name resolution and communication on a local network. NetBIOS provides three distinct services: Name Services (utilizing UDP or TCP port 137) allows for name registration and resolution.

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.

Should I turn off NetBIOS?

It is also recommended to disable NetBIOS over TCP/IP to improve network performance. Disabling NetBIOS over TCP/IP is especially recommended on Hyper-V and Windows Server cluster hosts with dedicated NICs used for traffic, such as iSCSI and Live Migration.

Is SMB and NetBIOS the same?

NetBIOS is completely independent from SMB. It is an API that SMB, and other technologies can use, so NetBIOS has no dependency to SMB.

Is it OK to disable NetBIOS?

What happens if NetBIOS is disabled?

It’s important for an administrator to determine if NBT is in use on the network, understand how to disable its use, and the implications of disabling. For example, disabling NetBIOS can break functionality for some processes if fully qualified domain names are not being used.

Is NetBIOS required for SMB?

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 . Generally speaking, on other systems, you’ll find services and applications using port 139 .

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