How do you secure a wireless internet connection?

I think someones leeching internet access from my parents wireless...I'm a noob so I have no idea how to see whats going on.

If you have access to the actual router look on the back or bottom and get the default login and password. Then find out the ip address of your computer while connected to the router. Type the ip address into your browser window, this should take you to the router's login page. Login using the default login and look at the connections being made to the router. Everything that's connected should be easily identified as one of your devices, if its not yours someone's leeching. You can stop this by either limiting their speed (f with their head a bit till they give up using your internet), changing/adding a password to connect to your internet (wep/wpa key, has to be entered on every device to connect to the router), or lock out any additional devices from using the router (pain in the ass).

bored4ever86 covered what you need to do, but the hard part is figuring out where you need to go to login to your router. What kind of router do you have, and do you have the instructions that came with it? Typically, the login info to the router is admin / password.

go to http://192.168.1.1/ in your browser while connected it will take you to your wireless routers controls then its just a matter with all routers passwords are normally admin - admin or something along those lines just jump in and go from there its pretty simple to get in, what makes you feel asthough some one is leeching? are your asked to put in a password when you connect wep or wpa ect.

Aside from finding your router's IP adress, there are several ways to secure the Routers' connection itself (when you have access to the router menu):

1. First of all change the way of protection of the datasteam -> Encypt it with WPA (or WPA2) with an AES Pre-Shared-Key (PSK) of at least 12 characters (with at least 1 number and 1 capital letter in it).

2. After that, enable IP filtering, so only the internal LAN IP's can connect to the router (192.168.x.x, etc).
(Mind that you have to keep adding new IP addresses every time you hook up a new internet device / PC to the router).

3. Finally, enable MAC filtering, so only the PC's at your house are able to connect to it.
(Mind that you have to keep adding new MAC adresses every time you hook up a new internet device / PC to the router).

Before you enable 2 and 3, make sure you have entered the right IP and MAC of at least the PC connecting to the router at that moment, before you're excluded from it and have to hard-reset it for it to be accessible again.

That's the most essential WIFI protection available at most modem/routers your can get! Good Luck!

Also prevent from showing your SSID(hidden)