Hello,
(We’ll release new firmware soon, since we are aware that the multi SSID operation of openWRT is not perfect in our former release)
You can set up a client SSID from Network > Wifi. You need to configure a network interface for it also by assigning an interface in the bottom in the advanced settings section. Then you also need to configure a firewall zone (let’s say WIFI2) for the new interface associated with that client-SSID. If it’s done you need to add a firewall rule for the new interface letting devices connecting from your desired interface, like WIFI > WIFI2 ACCEPT ACCEPT DROP. You may also have to create a rule for WIFI2 > (DROP) like the original WAN > (DROP) in the firmware (use DROP ACCEPT DROP and set Masquerading) You can delete WAN > (DROP) if you set the WIFI2 for wan. Also, set MSS clapmping for all rules.
You also have to set the new wan interface in the /etc/chilli/defaults file for WAN_IF.
The thing is that the setup script only works fine if you have one SSID only. So you have to run it when the router is in default state, then apply the settings above. If you had problems setting this up, let us know.
Steve