unix extensions This boolean parameter controls whether Samba implements the SMB1/CIFS UNIX extensions, as defined by HP. These extensions enable Samba to better serve UNIX SMB1/CIFS clients by supporting features such as symbolic links, hard links, etc... These extensions require a similarly enabled client, and are of no current use to Windows clients. Note if this parameter is turned on, the parameter will automatically be disabled. See the parameter if you wish to change this coupling between the two parameters. yes