Sunday, Apr 2, 2023

SMB and CIFS File Sharing in Windows 10

What is SMB? It stands for Server Message Block. It is a common networking protocol. It can be used to share files and folders on a computer. It's..

What is SMB? It stands for Server Message Block. It is a common networking protocol. It can be used to share files and folders on a computer. It's the preferred standard for sharing files and folders between Windows computers. CIFS, or File and Print Sharing, is a common alternative. Visuality Systems provides direct support for Samba software through their online helpdesk. In addition, Visuality offers online technical support for other Windows-based operating systems, including Windows Vista.

SMB 1.0

While SMB 1.0 is still widely used and supported, it does have some issues. It was designed for small LANs, and its chattiness could sabotage network performance. However, Microsoft estimates that SMB/CIFS compromises less than 10% of network traffic in an average Enterprise network. SMB 1.0 is a block-level protocol, but it can be exploited. Later versions of SMB improved the protocol's efficiency and reduced the number of commands from hundreds to just 19.

SMB 1.0 introduces a new concept called "durable file handles," which makes it easier for files to survive network outages. These network outages are common in wireless networks, but the ability to maintain a connection in the case of a short outage can be critical. With durable file handles, clients can cache changes without incurring the overhead of renegotiating sessions. Moreover, since files are usually changed and stored in the same directory, they are protected even if the network connection is down.

In Windows, SMB requires a client and server service to function properly. Every Windows computer contains a LanmanServer and LanmanWorkstation service. To check their status, you can use the Get-Service Lanman* PowerShell command. The LanmanServer and LanmanWorkstation services are installed by default on all Windows computers. However, after the WannaCry attack, people were advised to disable them. But they didn't realize that enabling LanmanServer was the best way to restore SMB 1.0 functionality.


The SMB protocol provides multiple advantages over other file systems, including the ability to synchronize cache to minimize round-trips and lock files. Oplock is a type of file locking. Files are locked by sending an Oplock request from the client to the server, which meets certain conditions to deny access. Oplocks are either level 2 locks or batch locks. Depending on the level, they can be either read-only or exclusive.

When SMB2 is used, it provides a secure, encrypted and authenticated intercommunication process. SMB allows clients to modify and delete files and browse a network. It also supports printing services. SMB version 2 has streamlined the command sequence number, and now supports symbolic links. The SMB protocol is the most popular and widely used network protocol. It provides a number of benefits to users, but has the greatest potential for misuse.

With SMB2, users can increase data security by enabling pre-authentication integrity. This ensures the integrity of session requests and subsequent negotiations. It also offers data integrity and encryption while in transit. SMB is also capable of enabling digital signatures for data packets. Several performance enhancements have been made over time, including a new feature called SMB Direct. In addition to speed and reliability, SMB has improved its compatibility with high-availability environments. It also supports transparent failover and scale-out file servers.


Disabling SMB1 in Windows 10 can be done by editing the registry. First, you must open the control panel. The legacy control panel displays the programs category, followed by a menu of programs. Then, navigate to the Windows Features section and select SMB 1.0/CIFS File Sharing Support. Then, click the check box to enable or disable subfolders. You can also add new folders if needed. Then, click OK.

You may be wondering why Microsoft is deprecating SMB1 in the new Windows 11 Home preview builds. In reality, the company is just phasing out support for SMB1 as part of its overall migration plan. This move may make certain networks unusable for users. However, you can still run network captures and test whether SMB1 is present. You may also want to upgrade any older servers if you are still using SMB1 for your network.

SMB uses the TCP and IP protocols to transfer data. It has the potential to be used on large, complex networks. It uses the TCP port 445 for file transfer. Initially, SMB operated on NetBIOS over IPX/SPX and IEEE 802.2. Microsoft continued to develop Windows for Workgroups, which included SMB functionality. However, users should note that SMB is not compatible with all older systems and that SMB1 is still more widely used today than ever.

CIFS 1.0

CIFS is a network protocol that enables client systems to communicate with servers over a network. It began as SMBv1 and has undergone a number of iterations, beginning with Windows 95. Although SMBv1 was a huge success in its day, it wasn't designed for the connected world we live in today. As a result, Microsoft deprecated it in 2013 and removed it from Windows editions. CIFS, however, continues to provide some useful features for Windows users.

Despite its popularity, SMB 1.0 does not have the same level of security protection as more modern dialects. The WannaCry ransomware attack proved this point. Since SMB 3.0 and later introduced more robust security features, most modern systems use it instead. Moreover, Windows 10 supports SMB 3.1.1, which is much more secure than SMB 1.0. Therefore, if you are using SMB in your enterprise, it is a good idea to choose a version that supports these newer dialects.

While SMB 1.0 supports client and AD domain connections, it's still recommended to disable it when updating applications or migrating data. Before proceeding, make sure to activate Zappiti Player on your PC. This will allow you to perform a CIFS file sharing operation without the need for SMBv1.

SMB 1.1

SMB is a file sharing protocol. It was introduced in 1992. Its goal is to make it easier for Windows machines to share files and printers among their users. SMB uses two security checks: user-level authentication and share-level authentication. The user-level authentication check indicates that the client is the one accessing the server. It is important to protect the user-level authentication checks and avoid unauthorized access. SMB 1.1 and 3.0 are widely used today, but there are still many differences between the protocols.

SMB 1.1 is similar to CIFS, and shares files over a network. SMB was originally designed to run over NetBIOS and TCP/IP interfaces. However, performance problems soon developed with the first version of SMB and its implementation. To address this, Microsoft introduced SMB 2.0. SMB 1.1 has a 16-bit data size, while SMB 2.0 uses 32-bit storage data fields. Microsoft added AndX support in Windows Vista.

Opportunistic locking is a feature of the SMB protocol that improves its performance. It controls caching of network files on the client side. Unlike traditional locks, opportunistic locking does not prevent mutual exclusion or file locking. It has four types: local, temporary, and shared. In general, the first two are the most common, although SMB 1.1 includes more. These features are essential for SMB servers.

SMB 1.2

When using SMB on a network, you should never use the venerable SMBv1. It's an outdated protocol that causes your Ned to weep. If you still use it, disable it and use HTTPS instead. This way, you'll be using more secure protocol, which most users have come to expect. However, some people use SMBv1 for old software and don't need it anymore.

SMB uses an exclusive OpLock to protect the integrity of shared files. This lock allows the client to assume exclusive access to a file, which reduces the number of round trips to the server. The server may send a break request to inform the client that the OpLock is invalid. It's recommended that you override this flag in the Session object. You'll also find two different APIs for SMB. The examples folder contains code that uses both low-level and high-level APIs. For everyday use, you'll want to use smbclient.

SMB has a lot of benefits. It supports file sharing, print services, and authentication and authorization. It also supports name resolution and service announcements. SMB can run on Linux/Unix servers and Windows desktops. It also integrates with Active Directory environments. The underlying OS also supports SMB over IP, and the ensuing security measures make SMB an ideal choice. In addition to the many benefits of SMB, this protocol is easy to install.

SMB 3.1.1

SMB 3.1.1 is a new version of SMB that was added to Windows 10 and Server 2016. The main changes are AES-128-GCM encryption and support for cluster rolling upgrades for SOFS. Additionally, this version also supports a new feature called Cluster Dialect Fencing, which enables servers to configure their maximum SMB variants based on the type of access they will be granted. SMB 3.1.1 is not yet available on Linux systems, but it should be added to your server as soon as possible.

SMB 3.1.1 offers a number of improvements over previous versions, including improved performance and security. It supports virtual machines such as Hyper-V and SQL Server, and manages connections across multiple nodes in clustered environments. However, SMB 3.1.1 does not work as well as its predecessors when it comes to handling server failures, and virtual servers that are not connected to storage can go offline. Transparent failover is another major improvement, which ensures that storage connections remain available for virtual servers, which is a boon for system administrators.

SMB 3.1.1 also offers improved protection against man-in-the-middle attacks. This new version of SMB incorporates a new pre-authentication integrity mechanism (PAIM), which verifies the exchange of authentication data before it is passed through the network. Additionally, SMB signing allows you to protect your data from eavesdropping during initial connection establishment, preventing attackers from altering packets. The new version of SMB is more secure than its predecessors, but you must still use caution and keep these things in mind.