my 2c worth
as others have said it's best to run the controllers from a different subnet/range of IP addresses.
My laptop and show PC are connected to my home router/internet modem, via Wi-Fi, which is IP address range 10.0.0.x and I connect to my controllers via LAN port on IP address range 192.168.0.x For instance, the laptop Wi-Fi adapter gets a DHCP address from the modem of, say, 10.0.0.12 but the laptop LAN port adpater is set as a
static IP of 192.168.0.1 controllers are also set as static IP addresses (such as 192.168.0.50).
Note: if your home router is already in the range 192.168.0.x you could set your controllers to something like 192.168.10.x
It will partly depend on what controllers you have and what IP range they can be set to (they should be able to be set to anything).If you're not sure how to set this up there are various guides that can help. There's one at HC
http://www.holidaycoro.com/kb_results.asp?ID=118 for their controller but it does show how to set the static IP on the LAN port (look for line that starts: Setup the PC Network