this post was submitted on 23 Aug 2023
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In general, I thought IP addresses are mutable while MACs stay the same, and I thought that's why the outside world uses IPs to identify networks while routers inside a network use MACs to identify specific devices. If you can change your MAC arbitrarily, doesn't that risk making the router's job more difficult? Why not just assign yourself a different internal IP?
The router recognizes a device based on its MAC and assigns an IP address. Traditionally, the MAC stays the same, so you’re right. In this case, OP doesn’t want to be recognized by the (airport) router. There is software for spoofing the MAC address for most platforms. Changing the MAC address has recently become more popular due to privacy concerns and on some operating systems it’s supported out of the box.
That's pretty cool.