Setting this thing up to work with a router was an extreme hassle. However, I wanted to write a review to try and help anyone else out who might've had the same trouble as I did—and are considering giving up.This guide is for anyone who's trying to set up this modem with a router (NOT a computer), and has found any of the other reviews to be unhelpful. This guide works with Windows 7+/Mac devices.So first off, my internet service provider (ISP) is AT&T. So before you start setting any of this stuff up, you'll need your ISP username & password.For anyone who's not tech-savvy, that is NOT:-Your Wi-Fi network name and password-Your Router's username and password.Your ISP username & password is what connects you straight to whatever company is servicing your internet. So it's not "admin/admin" or "admin/password." Unless you had it written down somewhere prior to this, it's not something you can just look around for and suddenly find.It's usually:-The original account email your company set you up with when you first began your service (for example, xxx@bellsouth.net) - so your personal Yahoo! or Gmail is unlikely to work.-A unique password (ex. kxe738) determined by your internet service provider - NOT something you chose for yourself.How do you get your ISP username/password? Just give a quick call to whatever company you use for your internet. Talk to a customer service rep. and ask for your ISP login information (if they need specifics, tell them it's your DSL/PPPoE login information).They'll need to confirm your identity, but overall it should be a quick and harmless process.So now you can get started with physically setting up your router (if you haven't already).-The power should be plugged in-The modem cable should be hooked up between the wall jack and the actual modemNow this is where you deviate from the official TP-LINK instructions they give you.-Plug your ethernet cable in between the modem and YOUR ROUTER.NOT a computer, like they tell you to. Your actual router device (I use Belkin, for example).At this point, the first three lights of your modem (Power, LAN, ADSL) should be consistently on. But you DEFINITELY won't have your internet working yet (if you do somehow, congratulations—you won't need these next few steps).Now assuming you still don't have internet yet:-Open up whatever browser you use (Chrome, Safari, etc.) and go to your router's IP address (basically, your router's menu). This depends on what kind of router you're using (and if you're not sure, please look up your Router brand), but it's usually something like 192.168.2.1.If you can access your router somehow, then you're almost done. Of course, your router may appear to be freaking out—with messages telling you how it's offline or it can't connect to your modem/internet. Rest assured, you'll get it working in a bit.So the next step is to:-Navigate your router's menu and look for "Internet Settings/CONNECTION TYPE". This is where it gets REALLY important.Most modern routers are set to "Dynamic," and a few are set to "Static." For this specific router, you'll need to:-FIND AND CLICK the "PPPoE" connection type, which requires that ISP username/password I mentioned earlier. This is VITAL.Once you click it, you'll basically be setting up the modem through your router. It may seem unlikely, but it really works.Now your router may ask for the following information:-Username-Password-IP addressRemember, the username and password they are asking for are your "ISP" USERNAME and PASSWORD. Not your Wi-Fi info, not your router login.Your actual ISP login information.Type that in, and for the IP address, it should ask if your "IP is assigned by provider." In most cases, choose "Yes."If not, and there's no IP address there already (or you don't know your own IP address), then enter "192.168.1.1."After that, click "Save" (or "Next," whatever option your router gives you). Your router should tell you that it's restarting.For a few moments, it may seem like nothing has happened. But check your router's menu to see if you have a connection, as well as the lights on both your router and your modem. A few seconds later, try visiting a website through your browser.If everything was successful, it SHOULD be working now!