Yes, we recommend binding a fixed IP to the MAC address of OpenSprinkler. Most routers these days support this (this is called DHCP reservation or IP reservation). This way OpenSprinkler is still in DHCP mode, but the router guarantees to assign it the same fixed IP every time. This is the recommended way because it eliminates the chance of setting the wrong gateway IP or not setting gateway IP at all (DHCP will automatically set these for you), or mistakenly setting two static IPs that are exactly the same causing IP conflict.