IP access control can be used to limit the access of NFS, iSCSI and Samba to certain IPs.
The IP Control is possible via the customer panel, if the customer has the appropriate ACL, as well as via the product management in the WHMCS Admin.
A list of allowed IPs is visible at the client area (if permissions allows) and admin area.
New IPs can get added from clients and admins.
Note about iSCSI
With iSCSI, only a single IP can be allowed access. This is due to an limitation of FreeNAS.
With the word "ALL" it is possible to allow any IP address.