Question according firewall-settings in openWRT/LuCI

I have the following setup, goal is, that clients connected to the GL-AR750 only can reach addresses in the internet.

Right now they also can connect to the GL-B3000 and it's connected stations, as they can access everything in the 192.168.1.1/24.

The firewall should be configured on the GL-B3000 in it's LuCI Network-Firewall-configuration.

DSL-Router
WAN DSL
LAN 192.168.1.1/24

GL-B3000
WAN over ETH 192.168.1.6, GW 192.168.1.1
LAN 192.168.6.1/24
WIFI1 192.168.15.1/24, GW 192.168.1.1
WIFI2 192.168.16.1/24, GW 192.168.1.1

GL-AR750
WAN over WIFI 192.168.16.2, GW 192.168.16.1
LAN 192.168.17.1/24

Any hints?

Thanks a lot,

kind regards thg

https://openwrt.org/docs/guide-user/network/wifi/wifiextenders/bridgedap
https://openwrt.org/docs/guide-user/network/wifi/guestwifi/start

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