Here's the thing, I don't want to buy a switch xD(yes, I use xD, sue me). I feel like such an ooga booga caveman when we have to download a 200 GB game at least twice, or even more when I have to take out my hdd and install it in my bro's pc. Can we just use the modem that we are both connected to? And if so, can you do the same with a router too?