Restart your router — this reassigns IP addresses via DHCP, usually resolving the conflict. Release and renew IP — on Windows, run ipconfig /release then ipconfig /renew. Avoiding local IP address conflicts between modem and router My new fiber optic modem comes by default at 192. Hardware Failures : Faulty transceivers, switches, or routers. Environmental Factors :. However, setting up a fiber optic connection to your router can seem daunting if you're unfamiliar with the process. The blue light on top of the router spins around for a. An IP conflict can be defined as a condition under which two devices will be addressed to the same IP address on the same network.