They can get a history of MAC & IP address from logs and their NAT can keep a history of IP Address & Ports and map back to the MAC address. They can do this already without asking for your MAC, just giving them the MAC address allows them to map it to a individual easier. So from a security measure this is not great. I can then spoof your MAC address quite easily. It's not really because I can obtain your MAC address if both of us are in the same Starbucks and on the same WiFi. They may think locking down WiFi to known MAC addresses is a good security measure. Any device connecting to the WiFi will reveal their MAC address, based on the ARP protocol. I think you should ask why they want to use the MAC address, not necessarily for privacy reasons "why do you need the MAC Address?" I think it's a reasonable question to ask them.įirstly, they will have MAC addresses of all the individuals who connect to the WiFi.
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