Spoofing? two devices on a home network.

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delange.kyle

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Oct 24, 2017
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Ive tried some research on 'spoofing' (i believe is the correct term) two devices on a network.
Basically what i'm trying to do is take the IP/MAC (idk which) from one device (lets call it dev A) and clone them to another (Device B). In theory, you would have two devices connected from the same IP/MAC, allowing device B to be invisible?
Would this even be possible?
Thanks
 
Solution
B
Your problem is the router is designed with the assumption that the mac address is unique. A router/switch knows which port a mac address is on only because it keeps track of which port it last saw a packet with the mac address come into the device from. Because both devices will be sending packets with the same mac the port will jump back and forth. The traffic will more or less be sent randomly to the 2 different device neither getting all of it so it likely will cause massive issues in actually using it.

Some commercial switches detect this as a network loop and may disable ports because of it or just issue log messages.
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bill001g

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Aug 9, 2012
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Your problem is the router is designed with the assumption that the mac address is unique. A router/switch knows which port a mac address is on only because it keeps track of which port it last saw a packet with the mac address come into the device from. Because both devices will be sending packets with the same mac the port will jump back and forth. The traffic will more or less be sent randomly to the 2 different device neither getting all of it so it likely will cause massive issues in actually using it.

Some commercial switches detect this as a network loop and may disable ports because of it or just issue log messages.
 
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