The value of the parameter (a string) is the highest
protocol level that will be supported by the client.
Possible values are :
CORE: Earliest version. No concept of user names. COREPLUS: Slight improvements on CORE for efficiency.
LANMAN1: First modern version of the protocol. Long filename support.
LANMAN2: Updates to Lanman1 protocol.
NT1: Current up to date version of the protocol. Used by Windows NT. Known as CIFS.
SMB2: Re-implementation of the SMB protocol. Used by Windows Vista and later versions of Windows. SMB2 has sub protocols available. SMB2_02: The earliest SMB2 version. SMB2_10: Windows 7 SMB2 version. SMB2_22: Early Windows 8 SMB2 version. SMB2_24: Windows 8 beta SMB2 version. By default SMB2 selects the SMB2_10 variant.
SMB3: The same as SMB2. Used by Windows 8. SMB3 has sub protocols available. SMB3_00: Windows 8 SMB3 version. (mostly the same as SMB2_24) SMB3_02: Windows 8.1 SMB3 version. SMB3_10: early Windows 10 technical preview SMB3 version. SMB3_11: Windows 10 technical preview SMB3 version (maybe final). By default SMB3 selects the SMB3_11 variant.
Normally this option should not be set as the automatic
negotiation phase in the SMB protocol takes care of choosing
the appropriate protocol.
The value default refers to SMB3_11.
IPC$ connections for DCERPC e.g. in winbindd, are handled by the
|Registry Path||Software\Policies\Samba\smb_conf\client max protocol|
|Value Name||client max protocol|