Manage the Deny List and Add MAC Addresses

You design and then plan your DHCP network infrastructure, and then you deploy it. You back up the databases and restore them when you need to. It just works and rarely do you hear any complaints about addressing issues. You can make it easier to exert some control over who connects to your network by configuring your MAC address allow and deny lists in your DHCP server. You can access this feature by opening the DHCP console and navigating down to the Filters node in the IPv4 tree note that filters are not available for IPv6 addresses. In general, you should have your list of MAC addresses that you want to allow or deny first, then create the filter entries, and then enable the allow or deny options.


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  4. DHCP Filtering!

You can see an example of this in the figure below. Figure 1. Figure 2. However, there is one more thing you need to do. Right click IPv4 in the left pane of the console and click Properties. Then in the IPv4 Properties dialog box, click the Filters tab. Note the warning here: So, before you start your MAC address filtering, make sure to read the next section, which will make entering MAC addresses in your allow list a lot easier.


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Figure 3. You could add new filtering lists by entering the MAC addresses of all the machines on your network in an Excel spreadsheet and then entering each of these, one at a time, in the DHCP console.

However, that would take a while. All you need to do is select one or more of the reservations from the list, then right click and then click Add to Filter and then Allow or Deny , as you can see in the figure below. This is a lot better than trying to hunt down MAC addresses and entering them one at a time.

Figure 4.

Notice when we right click on the entry in the leases list that there is another option: Add to Reservation. So after a little searching I found an addon from Microsoft Technet that does the trick. It is an MSI for 32 and 64 bit operating systems.

DHCP Filtering - Concurrency

So the installation is easy but it took me a minute to figure out how to configure it. In that directory a few files are installed. It adds log files, a config file, and a setup document. These entries are as follows. This is all covered in the setup guide as well. To setup the MAC filter list is pretty simple as well. Below is an example of the MAC filter list.

How to Change or Spoof MAC Address in Windows / Windows Server / macOS / Unix / Linux

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MAC addressing filtering for DHCP leases