Citrix SD-WAN

SMB 3.1.1 connection

The Server Message Block (SMB) Protocol is a network file sharing protocol. The message packets that defines a particular version of the protocol is called a dialect. The Common Internet File System (CIFS) Protocol is a dialect of SMB.

In Citrix SD-WAN release 10 version 1, the SMB 3.1.1 protocol is introduced on the Citrix SD-WAN WANOP and Premium Edition platforms.

The Citrix SD-WAN WANOP supports SMB 3.1.1 connections. The SMB 3.1.1 connections are applicable when the client is Windows 10 and the server is Windows Server 2016.

When SMB 3.1.1 traffic passes through the WANOP module:

  • It is counted/visible as part of SMB 3.1 CIFS un-optimized connections

  • The following trace message is displayed, “Pass Through this connection as SMB 3.1.1 is not supported”.

Client Server SMB version
Windows 10 Win 2016, 2012R2 SMB 3.1.1, 3.0.2
Windows 8.1 SMB 3.0 SMB 3.0
Windows 7 SMB 3.0 SMB 3.0

For non-optimized connections, the Citrix SD-WAN WANOP appliance GUI displays a message for SMB 3.1.1.

In the Citrix SD-WAN WANOP appliance GUI, navigate to Monitoring > Filesystem (CIFS/SMB). Click the Non Optimized Connections tab, the following message is displayed, Protocol optimization of SMB dialect 3.1.1 is not supported. There are no log entries available, and there is no new configuration required in SD-WAN WANOP to support this.

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SMB 3.1.1 connection