![]() (I again refer you to Graeme Noble here.)īut for troubleshooting my parents' network, the solution was simple: Kill the network make the modem a dumb pipe enjoy sweet, blissful AirPort-based Internet. I will note that there are other options to preserve a Double NAT network or adjust it otherwise, if that's what you want to do. How to stop your crappy cable modem Wi-Fi from ruining everything In my folks' case, the cable modem's Wi-Fi network wasn't properly assigning the AirPort base station an IP address or DNS, causing a cascade of problems that resulted in my MacBook Pro's internet agony. This is admittedly an imperfect metaphor - don't kill me, IT nerds - but hopefully illustrates the general point: Double NAT can (not always, but can) make networking confusing and crowded. ![]() It's going to get crowded quickly, right? Now imagine that inside that complex, one of the residents (your second Wi-Fi network) has created a single-occupancy room right inside the front door, and stuck a bunch of bunk beds inside it anyone new who comes to this complex is now stuck living in this room, which is now its own mini-apartment complex. Inside each complex is a bunch of single-occupancy rooms for people, each with their own apartment number (Private IP address). In order to fit more people (devices) on your street, the housing (cable) companies instead build apartment complexes, each with its own unique number. ![]() Imagine a world where every house number (IPv4 addresses) on your street (the internet) is unique. I'm going to skip a lot of the technical issues inherent here and point you to this excellent explainer on Double NAT by Graeme Noble, but here's a quick metaphor to kick us off: A cable modem that, like most modern modems of its day, also came equipped with a Wi-Fi network.įor many households, this isn't an issue: You connect to the router in question and its random Wi-Fi network name, likely typing any number of random characters in for the password, and you enjoy clean, crisp, wireless internet access.īut if you also plan to set up your own Wi-Fi network - whether that's a mesh system or Apple's own aging AirPort brand - connecting a Wi-Fi network to a modem that already has an existing Wi-Fi network can cause connection issues. Unbeknownst to me, my folks had switched cable companies since my last visit - and with that switch came a new cable modem. A double-click on our AirPort station revealed that the router was supposedly running without an internet connection, IP address, or DNS - and that's where I got interested. ![]() If your response to that image is something between an eyebrow raise and a chortle, yeah. ![]()
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