You can refer to the existing wireless interface configuration. Basically, you should add option isolate '1' under the corresponding wifi-iface section, at the same level as the SSID configuration:
Please refer to the content of this thread?
If you only plan to add a new network without VLAN-related settings, you can instead refer to steps 2–5 below:
WDS compatibility across different chipset brands/models is generally not very reliable, so we only recommend using it between the models that using same chipset, such as:
- Flint 3 + Flint 3
- Flint 3 + Slate 7
The OpenWRT community also offers some tutorials that might be helpful: