Problem with router configuration or connectivity.
Problem with router configuration or connectivity.
Why? Having several routers on the same network is not typical. You're likely looking for conflicts or trying to set up an access point. That device acts as a fiber gateway, typically provided by your ISP. Often these units can't be switched to regular router settings and are mainly useful for connecting you to your ISP's network. Generally, you shouldn't convert an ISP gateway into a router.
If you restart it, access to the admin panel at those IP addresses becomes unavailable.