I don't know what kind of customers your customers are. In the past, our school used the client of urban hotspots. If you can get the IP address before logging in, you can try this method. Now the DHCP service in the wireless router is turned off, so you must turn it off. At most, change the intranet address of the route to something else to avoid ARP attack, and then plug the incoming network cable into the local area network end of the router (the local area network end is not the wide area network end). Then all clients are connected to wireless or wired interfaces, and the router becomes a switch, and then all clients are connected to their own clients. This method requires each client to have an account.

In addition, in fact, some operators actually use PPPOE when logging in with special dialers.