&gt; Maybe I&#x27;ll just block all those addresses and only enable them in the firewall when I want to check the modem status.<p>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&#x27;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&#x27;s the ISPs fault.