Is it possible that your network devices are acting as hubs not switches? That would essentially make all the devices on that section of network be on the same "wire". Are all the ports on the switches "isolated" from the others?Is some piece of eq...
But in Modem Mode the device is acting like a bridge simply connecting VM Coax to your "Cat5" so doesn't work at IP level. It shouldn't have IP address other than the internal one to get to it to monitor or admin. Or this is my understanding of thi...