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ENABLING SMB SIGNING

Data ONTAP supports Server Message Block (SMB) signing when requested by the
client. You can enable SMB signing on the storage system. By default, SMB
signing is disabled.


ABOUT THIS TASK

SMB signing helps to ensure that network traffic between the storage system and
the client has not been compromised by ensuring that all SMB messages have valid
signatures. When SMB signing is enabled on the storage system, it is the
equivalent of the Microsoft Network server policy "Digitally sign communications
(if client agrees)".

If this option is enabled, then the storage system does the following:

 * If the client requests SMB signing, communications between the client and
   storage system use SMB signing.
 * If the SMB signing is not enabled on the client or the client does not
   request SMB signing, communications proceed normally without SMB signing.
 * If the cifs.smb2.signing.required option is also set to on and an SMB
   2.x-capable client requests SMB signing, the storage controller uses SMB 2.x
   with signing.
   
   If the client cannot establish an SMB 2.x session with signing, the client
   falls back to an SMB session with or without signing, and the storage system
   uses whichever the client requests.

Note: You must terminate CIFS services by using the cifs terminate command to
ensure that all existing CIFS connections are terminated prior to enabling SMB
signing. After you have enabled SMB signing, you can restart CIFS services.


STEPS

 1. Terminate CIFS services by using the cifs terminate command.
    
    See the cifs terminate man page for more information.

 2. Enter the following command:
    options cifs.signing.enable on
 3. Restart CIFS services by using the cifs restart command.


RESULT

All new connections use SMB signing if requested by the client.
Parent topic: Support for SMB signing
Copyright © 1994-2013, NetApp, Inc. All rights reserved.
Part No. 215-07984_A0
May 2013



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