So you are letting other devices in your local network see your MAC address, and when you use your WiFi in a public WiFi hotspot, the MAC address is visible to the hotspot router, and any device also using the hotspot that may be sniffing WiFi traffic at the hotspot.Īs mentioned by piperspace, some network facilities (think schools, or other places where they only want members of the select group to have access) need to register their MAC address so that the routing equipment will know your device is part of the allowed group of users (this is an alternative to using passwords that may be given out to visiting friends, that the facility does not want). It will be stripped off of the message at your router, and the body of the message will get a new router MAC address for the next hop. When you send network packets over ethernet or WiFi, your MAC address is included in that message. The MAC (Media Access Control) address is unique for every ethernet or WiFi interface and is assigned when the chip is created.
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