So I have a wireless network in my apartment that a lot of my friends/roommates use pretty frequently. I'd like to have a little fun with them by tinkering with the network, and I've come to you fine people for ideas. What can I do to prank my friends? I have a Netgear WPN 824 router; my friends are running Vista, XP, or a Mac. I'm running Vista home. I saw the upside down ternet (http://www.ex-parrot.com/~pete/upside-down-ternet.html), which would be awesome - I don't know how to implement that though. Any tips? Note that I would like them to remain my friends, so I would prefer to avoid anything too obnoxious.

Just so we're on the same page, do you have administrative access to the router?

Yeah, it's my router and I'm the only one with admin access.

I found this post that seems to mess with people on wifi as well. http://haxbyjaku.com/projects/rick-roll-proxy/ The post mentions having a VM of everything available if people are interested, might be worth it to comment the blog or email the guy.

Generally speaking, home routers are incapable of tricks like these, you need to use a computer, commercial router or a home router with the dd-wrt firmware. Unfortunately it looks like your router isn't supported by dd-wrt so you'd need to do the computer router bit, which is semi-involved and requires a linux computer. google'll get you some tutorials if you want to pursue the prank.

Use the newly discovered protocol flaw in TLSv1/SSLv3 to perform a MITM attack against them when they're using your network and steal their bank account information. They'll think it's hilarious. Also, you can buy pies with their money. Which is awesome. If not slightly fattening.

You don't really need to flash the router. Just disable DHCP on your router and add your own routing magic served up by your own DHCP server running on a PC. You need two private IP subnets. Say, 192.168.1.X and 192.168.0.X . We'll say the .0 subnet is the subnet your router listens on (so it's at, say, 192.168.0.1) and your messing-with-people machine is also on that .0 subnet. Along with any other machine you want to have normal Internet access. The messing-with-people machine also has a second IP on the same interface, say 192.168.1.1. Not .0.1 -- that's the router. Set up a DHCP server (like dhcpd) that advertises your .1.1 network with your machine as the default gateway. Set up iptables rules to NAT any non-port-80 traffic. Port 80 traffic gets redirected to your transparent web proxy that messes with people. Edit: oh wait that's right, google for howtos like the guy said. I bet they accomplish the same thing but explain it better.

We don't allow threads on pranking people.