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Ubuntu - Samba - SMB Protocol Versions

According to the Samba Official Wiki the Linux cifs kernel client has been included in the kernel since kernel version 2.5.42.

SMB3 is the now the default dialect (SMB3.02/SMB3/SMB2.1 dialects are requested by default).

CIFS protocol (and other old dialects) can be selected (by specifying “vers=1.0” or “vers=2.02” in the mount options.

vers=3.11	SMB3_11	Latest, more secure version
vers=3.0	SMB3	Windows 8, Windows Server 2012
vers=2.1	SMB2_10	Windows 7, Windows Server 2008 R2
vers=2.0	SMB2_02	Vista SP1, Windows Server 2008
vers=1.0	SMB1	NT1 i.e. Windows 95, NT 4.0

Specify with “vers=” and consider that the Linux kernel does not fully support all of the features in these new SMB versions. The newest, most secure dialect, SMB3.11 can also be requested (vers=3.1.1).

Add the following lines to /etc/samba/smb.conf

/etc/samba/smb.conf

server min protocol = SMB2
server max protocol = SMB3
client min protocol = SMB2
client max protocol = SMB3
min protocol = SMB2
max protocol = SMB3
client ipc min protocol = SMB2