I can, like most modems, log into the configuration file and monitor the coaxial cable signals over the 8 downstreams my ISP has allocated me using the 192.168.100.1 IP address. How is it that I'm able to access that IP address when the modem is technically the next hop after the router? Doesn't NAT restrict all local IP addresses to the 4 Ethernet ports on the router? So how can my WAN port allow access to private IP's? Or is it something that routers firmware, by default, allow because cable modems are so prevalent?