Before we combined one of our networks, the MX appliance was tracking clients by IP. When we went to combine the networks, this is the message we are getting:
"Security appliance networks tracking clients by IP addresses cannot be combined with other networks"
Also in the Address & VLANs section of the MX appliance, the option to track by IP if there is a Meraki layer 3 switch, is not available.
![Appliance Capture.png Appliance Capture.png](https://community.meraki.com/t5/image/serverpage/image-id/6523i3737F35C0BF5E26E/image-size/medium?v=v2&px=400)
Why is this option, IP address, grayed out? If we track by MAC address the MX is only going to see the MAC address of the Layer 3 Switch.