<div>
For ISL and INSL, you can only use blank values. &nbsp;I would try using both in a development environment with logging and seeing what happens. &nbsp;I too cannot find a definitive answer. &nbsp;What version of PowerShell are you using?
</div>


<div>
Found the answer after investing the time I was hoping not to have to invest.
</div>


<div>
<div class="content wysiwyg-content">
I'm trying to wrap my head around DHCP Policies, and am looking at the <a href="https://technet.microsoft.com/en-us/library/jj590655%28v=wps.630%29.aspx" rel="ugc">Add-DhcpServerv4Policy </a>powershell command. &nbsp;Specifically, in the FQDN parameter, I find the following direction: <i>&quot;The first element is the comparator, EQ, NE, Isl, or Insl, and the subsequent elements are values. For the comparators Island Insl, use a blank value.&quot;</i> &nbsp;What I can't find is when I'd want to use ISL or INSL comparitors? &nbsp;<br />
<br />
I figure for 500 points, I'd like to buy a clue please.
</div>
</div>


I'm trying to wrap my head around DHCP Policies, and am looking at the Add-DhcpServerv4Policy  (https://technet.microsoft.com/en-us/library/jj590655%28v=wps.630%29.aspx)powershell command.  Specifically, in the FQDN parameter, I find the following direction: "The first element is the comparator, EQ, NE, Isl, or Insl, and the subsequent elements are values. For the comparators Island Insl, use a blank value."  What I can't find is when I'd want to use ISL or INSL comparitors?  

I figure for 500 points, I'd like to buy a clue please.

Powershell comparators Isl and Insl for FQDN

Windows PowerShell is a task automation and configuration management framework from Microsoft, consisting of a command-line shell and associated scripting language built on the .NET Framework. PowerShell provides full access to the Component Object Model (COM) and Windows Management Instrumentation (WMI), enabling administrators to perform administrative tasks on both local and remote Windows systems as well as WS-Management and Common Information Model (CIM) enabling management of remote Linux systems and network devices.

Powershell

Windows Server 2012 is the server version of Windows 8 and the successor to Windows Server 2008 R2. Windows Server 2012 is the first version of Windows Server to have no support for Itanium-based computers since Windows NT 4.0. Windows Server 2012, now in its second release (Windows Server 2012 Release 2) includes Foundation, Essentials, Standard and Datacenter, and does not support IA-32 or IA-64 processors.

Windows Server 2012

The Dynamic Host Configuration Protocol (DHCP) is an auto configuration protocol used on IP networks and an extension of the Bootstrap Protocol. DHCP allows for computers to be configured automatically to communicate with each other over an IP network without the need for manual setup by a network administrator. The implementation of DHCP relies on a DHCP server to hand out network configuration information to DHCP-capable clients that request an IP address (and other information required or useful in communicating with other devices on an IP network). In addition to an IP address, common configuration information served over DHCP includes a default gateway, subnet mask and DNS sever(s).