Use SMB/CIFS signing when mounting Win shares

Hi,

We have a number of Windows Server 2003 shares mounted on our AIX server via CIFS, using a command similar to this:

mkcifsmnt -f /test -d testshare -h testserver -c testuser -p pass -w DOMAIN

The windows servers are currently being upgraded to 2012, and as part of this they are setting SMB/CIFS security signature as a requirement (they won't be able to turn it off) via the following Windows Server reg setting:

HKLM\System\CurrentControlSet\Services\LanManServer\Parameters\RequireSecuritySignature

Once this is set, our AIX CIFS mounts stop working because from what I can see the AIX CIFS mount doesn't seem to use message signing.

I presumed there would be setting to turn it on, but I can't find anything. Does anyone know if message signing is supported by the AIX CIFS packages?

Our AIX version is 6100-09-05-1524, and the CIFS package versions are as follows:

lslpp -L | grep cif
  bos.cifs_fs.rte           6.1.9.45    C     F    Runtime for SMBFS
  bos.cifs_fs.smit           6.1.6.0    C     F    SMIT Interface for SMBFS

I would be very grateful for any help that you can provide.

Andy