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This is routine stuff and has been solved quite elegantly by wireless infrastructure device manufacturers. Buy one or more Cisco Meraki access points and the process of creating the captive portal with a splash page or self-service authentication is extremely easy.


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You need to set the port on the switch to accept tagged packets. This is usually accomplished by changing the port mode to trunk. On the firewall, you also need to set up packets for that subnet to be tagged as VLAN 2, and you will need to set the switch port mode to trunk. On some firewalls, you actually create a new virtual interface for the VLAN. I have ...


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What you missed is that promiscuous mode only captures traffic that your promiscuous NIC sees. It doesn't have magical powers to go out onto the network and collect packets destined for other NICs. Modern networks use switches, which inspect the destination addresses of packets and only send it to the port it needs to go to, rather than broadcasting it to ...


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This might happen automatically with a proper captive portal. However be aware that the sign in 'recognition' that you see on that android device is not a feature of the wireless network itself, but a feature of the client device. In other words it is up to client devices whether or not they are able to detect if an open wifi network has a captive portal ...


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As long as the two devices are not active at the same time, then it won't be a problem. How quickly the network realizes that the MAC address has moved from one device to the other depends on the specific implementation of the switches used in the network as well as on the traffic patterns. In principle what you describe would look the same to the network ...



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