If you want to use both the network port and Wi-Fi on the guest network, then you follow these steps.
- create a bridge device named
br-guestand addeth3to the bridge ports - delete
eht3frombr-lan - Edit the
Guestinterface, remove the bridge configuration, and checkbr-guestin the device options - Find the guest Wi-Fi in
Network/Wirelessand turn off theIsolate Clientsoption
The /etc/config/network configuration file should like:

result:

