Most wireless routers have a security feature called MAC filtering. Each network card on a computer comes with a unique MAC address. MAC filtering allows the user to specify which computers are allowed to use the wireless network by entering the computer’s MAC address into the whitelist. This is a security tip that I see often when reading about securing wireless networks. When used by itself, or with WEP, it can give the user a false sense of security. I’m going to show you how this security layer can be bypassed.

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1. Jul 12, 2017  Block MAC Now that the MAC addresses have been noted, login to the router’s admin page, head over to the Wireless section. And select Wireless MAC Filter.
2. Oct 17, 2017  However, if you have MAC address filtering enabled, the hacker can bypass all that trouble and simply grab your MAC address, spoof it, disconnect you or another device on your network from the router and connect freely. Once they are in, they can do all kinds of damage and access everything on your network. Other Solutions to the Problem.
3. Dec 21, 2010  Most wireless routers have a security feature called MAC filtering. Each network card on a computer comes with a unique MAC address. MAC filtering allows the user to specify which computers are allowed to use the wireless network by entering the computer’s MAC address into the whitelist. This is a security tip that I see often when reading about securing wireless networks.

For this hack, I’ve setup a test wireless network with a wireless router and three computers that are allowed to connect. A fourth computer, my laptop, will be used as the attacking computer. The wireless router’s SSID is ghost, it uses WEP for encryption, and employs MAC filtering. Here’s the attack plan:

I’m going to answer the question you asked, then the question you might mean. The MAC address is the physical “serial number” of the network card in your device. It’s supposed to be unique worldwide. It’s only used by machines on your local netwo.

1. Figure out what MAC addresses are on the whitelist so we know which computers are allowed to connect
2. Change our MAC address to one that’s on the whitelist
3. Crack the WEP key
4. Use the WEP key and our fake MAC address to login to the wireless network

So the first step is to figure out what MAC addresses are on the whitelist. This is relatively easy and just involves running airodump-ng. Here’s what it looks like when I point it at ghost:

Right away we see that there are three clients connected to ghost. More importantly, it displays their MAC addresses under the STATION column. Now we know which computers are on the whitelist.

Next, we need to trick the wireless router into allowing our computer to join the network. The way we do this is by changing our MAC address to one that’s on the whitelist. Let’s target 00:1D:4F:XX:XX:XX. The series of commands that will change our MAC address:

At this point we can start cracking the WEP key using a combination of airodump-ng, aireplay-ng, and aircrack-ng. There are also various automated tools to assist with this, such as the script I described in a previous post

Start by capturing all the packets:

For this example I’m using the ARP request replay attack. You may need to experiment with the different kinds of attacks until you get one that works properly:

Finally, crack the WEP key:

Assuming all of that went well, you should now have the WEP key required to authenticate to the wireless network.

Final step, authenticate to the wireless network. I’m using a USB based wireless adapter, so I just unplug it and plug it back in, then change the MAC address again to one that’s on the whitelist and use the network management program to authenticate and log into the wireless network. So we’ve seen how easy it is to bypass this security layer. That doesn’t mean you shouldn’t use it though, every extra hurdle the attacker has to go through puts them one step further from their goal. While it won’t stop a determined attacker, it will stop casual users and script kiddies. If you choose to use MAC filtering, pair it with WPA2 and use a good passphrase to keep out the bad guys.

It’s 2017 and more than half of the world’s population are the internet now. Apart from being connected to mobile networks or public WiFi hotspots, the next available source of internet (in most cases) is the home WiFi network. But it just doesn’t end there.

You have leeching neighbors and YouTube addicted roommates to handle as well. Imagine, you wake up one day to find that the internet pack has been drained dry. Man, that would be a nightmare.

Not to worry, we at Guiding Tech, have a neat and easy solution on how to block devices from your home WiFi network.

We will be exploring two methods to control the home WiFi system. The first is through MAC address filtering and the latter is through a third-party app on your Android phone. So, let’s begin.

See Also:Common WiFi Problems and Solutions

1. MAC Address Filtering in PC

Mac Filter Wifi Hack Android Download

Media Access Control or in simple terms, MAC Address are unique addresses assigned to a system by its manufacturer. Unlike IP Address, the MAC address of a system remains same throughout and doesn’t change. First, you’d need to obtain the MAC addresses of all the connected devices.

1. Scan Network

Wireless Network Watcher is a nifty app which can help you in scanning the devices connected to your WiFi. All you need to do is download the app and run the scan.

The scan which roughly takes only a couple of seconds to complete lists all the connected devices. Once done, double click on the trespassing MAC address and copy it to a clipboard.

2. Block MAC

Now that the MAC addresses have been noted, login to the router’s admin page, head over to the Wireless section. and select Wireless MAC Filter.

Once inside the page, choose Reject and match the MAC address against the one you have noted. Click on Apply and you are all set, to enjoy a distraction-free WiFi network.

Another alternative is to whitelist only the recognized devices. Select Accept and include only the familiar MAC addresses. Once saved, though the WiFi network will continue to show, no new device will be able to connect to your network.

So, the next time even if your neighbor manages to decipher your WiFi password, the whitelist feature will keep you safe.

If your router homepage doesn’t contain a link to MAC filter, you might find it in the advanced setting.

2. Block Through Android

The second method makes use of a popular app called NetCut. A very popular app for analyzing WiFi connections, it’s catch is that it works only on rooted Android phones.

Once the superuser permission has been granted, NetCut will show all the available devices. Akin to the first method, you’ll need to obtain the MAC addresses first.

Now all you have to do is tap on the chosen address and slide the WiFi bar to zero. The best thing about this app is that the changes occur in real time which means that as soon as you slip the slider down, the connection to the user will cease.

Speaking of rooting Android devices, check out the advantages and disadvantages of it.

Calling It a Wrap!

So, these were some of the methods by which you can offload freeloaders from leeching on your home WiFi network. Given the state of privacy and security these days, it’s imperative that we have a finer control over the WIFi usage. So, which is your favorite method?

See Next: 3 Simple Steps to Turn Off Public WiFi Notifications

The above article may contain affiliate links which help support Guiding Tech. However, it does not affect our editorial integrity. The content remains unbiased and authentic.Also See#privacy #wifi

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