This is a nice thing to do if you are in a hotel and want to redistribute a single WiFi connection to other computers.
The setup works as follows: The WiFi with the SSID
Telekom is the one being provided in the hotel. Here we can connect to it without encryption, the interface name is
wlan1. We then create a second WiFi network where the router should act as an access point for other clients with the SSID
Fireburned and we protect it with WPA2. Its interface name is
wlan0. When then have to set the ifname in the wan network section to
wlan1 and that’s basically all there is.