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Captive portal
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==== MAC spoofing ==== A captive portal that uses MAC addresses to track connected devices can sometimes be circumvented by re-using the MAC address of a previously authenticated device. Once a device has been authenticated to the captive portal using valid credentials, the gateway adds that device's MAC address to its allowlist; since MAC addresses can easily be spoofed, any other device can pretend to be the authenticated device and bypass the captive portal. Once the IP and MAC addresses of other connecting computers are found to be authenticated, any machine can spoof the MAC address and [[IP address|Internet Protocol (IP) address]] of the authenticated target, and be allowed a route through the gateway. For this reason some captive portal solutions created extended authentication mechanisms to limit the risk for usurpation.{{explain|date=November 2024}}
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