How Do I Block A Specific Computer From Using Our Wireless Network?

I won’t go into a lot of details, but to cut a long story short, I would like to know how I can block an individual’s computer from using our home wireless network. The person is my brother’s very rude and impolite girlfriend who gained access to our wireless network because she came to our house saying that her laptop was having a problem that needed fixing. The problem was drivers that needed to be downloaded, so I logged her laptop in to our password protected D-Link wireless network router and her computer automatically saved our network on her laptop.
Since then, however, she has been coming to our house EVERY DAY to download huge files using our wireless network. My brother won’t do anything about his own girlfriend, but the reason I would rather not confront her because she is bipolar and she is taking medication; she constantly flips out over nothing.
The solution I have in mind is to block her computer using something called MAC-address exclusion, but I have no idea how to do this– I’ve only read about it and no one gave any specific details about how to go about doing this. Please can someone tell me, step by step how to block her computer from using our internet. I believe this is the only way we can block her internet access and not cause any bad blood between my brother and me for doing it. Neither she nor my brother are good with computers so they will never figure out how her computer is blocked, or bypass it.
If anyone has any other solutions as well, please kindly share those with me in detail as well. She is not welcome here and she needs to be stopped from abusing our hospitality, especially when she is rude and impolite to everyone when she comes here. Also, she is using up our monthly data allowance so it needs to stop.


  1. First, open up internet explorer (or the browser that you use), then enter into the address bar (that should be the right IP for your router), then go into the Advanced tab, then click the filters button. Now click the MAC Filters radio-button, and the Only deny computers with MAC addresses below, then click the drop-down for the DHCP Client, and click on her computer’s name / MAC and click apply.
    I also uploaded a screenshot:
    If doesn’t work, you can click start > run > (or vista, search cmd into the start menu) > type cmd > type ipconfig into the Command Prompt and press Enter > Now the IP you need to put into the address bar should be under “Default Gateway”.

  2. Easiest way is to change everybody else’s password to get in. But that sounds like it’s not really possible.
    Another possibility is make sure everybody is on, and then limit the internal network to only X number of PC’s on, by limiting the number of internal IP addresses handed out from DHCP. If your network only hands only 6 IP addresses, then only 6 PCs can get on. A 7th one can log into the router, but won’t be able to access the Internet. Someone needs to give up their spot for the new PC. And who’s gonna do that?
    MAC exclusion requires you to find her MAC, but that’s not THAT hard if you can access the router admin screen while she’s on. You have to figure out her MAC address, then enter it on the MAC exclusion in the router admin.
    One more possibility is turn on filters that will block out most of the P2P traffic to her node, but then I don’t know what she’s using to download, so I can’t recommend something specific yet.

  3. Change the security codes on the router, change it in every computer in the house and don’t tell your brother.
    I refuse to use a wireless router, no matter how secure you can make them. I have 10tb of video and photo files and I keep my computers very, very secure. I picked up a virus once and felt lucky I only lost 10% of my work. It took me a month to get rid of it, running virus software was not enough.
    Keep those babies locked up tighter then a drum.

  4. Well if your brother is an advanced user, he can easily fake the MAC address, there for bypassing MAC exclusion… I’ve done it to prevent tracing when I hack WEP. The simplest solution is to reset the security on the router. The most secure code that most routers support is WPA2, and I believe the code has to be 16 digits. It can be anything, or you can have the router automatically generate one and you can save it to a txt file.
    -To do this, you have to log into the router. I’d imagine you know how to do this if you set up the current network and if so skip the rest of this bullet, but if not continue. Open up any web browser and type in the gate way address. If you don’t know the gateway address double click the wireless icon (if your using Windows default wireless manager and not one from the your wireless adaptor card.) on the lower right corner of the screen and go to support tab. It will tell you the gateway. Once you type that in, it will prompt you to log in, default user should be admin and the password should also be admin. Sometimes there isn’t a password at all. Depends on brand. I think there isn’t a password on D-Link.
    -Once your in, the set-up is different by router, but generally look in something with “wireless” “security” or “settings” or all of them. Look for a field with the security code and select the type “WPA 2” and type in a password, or a keyword to automatically make one for you.
    -Connect all the computers you want to using this new code. When your brother (or his gf) try to log in, it won’t give them access.

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