New answers tagged captive-portal
You should consider using a central RADIUS server for authentication. It will keep a list of valid (and logged-in) users/devices and can inform the access points about the status of a device, which then needs to manage only currently connected devices. Another approach, which can also be combined with the RADIUS solution, is to have a central, powerful ...
You'll need two network cards in the CentOS server and let it act as a router. Chilispot doesn't have a built-in DHCP server, IIRC. Install dhcpd on the CentOS machine or use the one that might be offered by the access point. To my knowledge, Chilispot is dead (last release in 2007 or something).
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