> Maybe I'll just block all those addresses and only enable them in the firewall when I want to check the modem status.
For the business networks I manage I actually go out of my way to make sure that 192.168.100.1 is blocked. With no authentication anyone can reset a Motorola modem to factory defaults which takes like 15 minutes to come back up. An attacker can just jump on a guest network and basically DoS you until you figure out what's going on and good luck with that because most people are going to assume that their modem constantly rebooting means that they need a new one, or it's the ISPs fault.
For the business networks I manage I actually go out of my way to make sure that 192.168.100.1 is blocked. With no authentication anyone can reset a Motorola modem to factory defaults which takes like 15 minutes to come back up. An attacker can just jump on a guest network and basically DoS you until you figure out what's going on and good luck with that because most people are going to assume that their modem constantly rebooting means that they need a new one, or it's the ISPs fault.