This one can go in both. I've had a couple of weeks of trouble trying to get our back-up internet working again, and had been on-and-off trying to sort it between jobs. The device I thought was handling all the DHCP and bits and bobs didn't seem to be working. So I decided to configure a new router, but it still wouldn't work. I'd been trying to figure out what was going wrong and figured out the new device was handing out the wrong Gateway. f**k if I could find where to change the Gateway settings being handed out though. So I figured, f**k it, I'll go factory reset the old one and just rebuild it.
So I went over, held in the reset button, it boots back up with all its settings in tact and now working fine...first thing I did was restart that f**king device!
I'm happy its sorted now but...f**king hell. That'd been causing me some right aggro.