[Q] WiFi Network Blocking Mobile Devices

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lkpfaff

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Dec 26, 2014
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Hi, I have a question about the unique identifiers that are transmitted to a network by an android device. So, basically my schools wifi network blocks all mobile devices (android, iphones) but it works on laptops. Authentication is done through 802.1x and everyone is assigned their own username and password. When they started blocking phones I thought that they detected them through MAC addresses or hostnames but I was wrong. Does anyone know how they can differentiate between laptops and mobile devices?
 

zelendel

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Aug 11, 2008
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There are many ways and none of them can be blocked if they are smart enough. For example all it has to do is quarry device connection type and it would reg as a mobile device.
 

lkpfaff

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Dec 26, 2014
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There are many ways and none of them can be blocked if they are smart enough. For example all it has to do is quarry device connection type and it would reg as a mobile device.

Interesting, I have looked into device fingerprinting which can detect the OS type. I wonder if it can be spoofed by editing build.prop.
 

zelendel

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Interesting, I have looked into device fingerprinting which can detect the OS type. I wonder if it can be spoofed by editing build.prop.
It might detect os type but I think it would be more complicated then that. Heck all they have to do is quarry any IMEI. If it comes back with one then it is blocked.

Be careful editing the build prop it could cause huge issues as you would have to remove alot of info the device needs.
 

lkpfaff

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Dec 26, 2014
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It might detect os type but I think it would be more complicated then that. Heck all they have to do is quarry any IMEI. If it comes back with one then it is blocked.

Be careful editing the build prop it could cause huge issues as you would have to remove alot of info the device needs.

I believe it does detect the OS type as that is what I have found other systems do. I didn't realize the router could detect things such as the IMEI.
 

zelendel

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The network itself could be set to detect many things. Like I have all mobile devices blocked on my network except for a few approved devices and it's all done by Mac and imei
 

lkpfaff

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Dec 26, 2014
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The network itself could be set to detect many things. Like I have all mobile devices blocked on my network except for a few approved devices and it's all done by Mac and imei

I figured out how they're doing it. Their using DHCP fingerprinting. Based on this some of the material I've read, reordering the requests in the dhcprequest packet would fool the system. Is iit possible to do that on android?