How does isolation in Guest networks work in Gl.iNet

How does isolation in Guest networks work in Gl.iNet?

Gust firewall rules? How router’s firmware prevents guests to access real network?

Like all routers do: By using firewall rules.
(And by not having routing rules between the zones)

Like @admon said firewall rules.

But wifi also have this option not sure if the option is exposed via the gl ui, however this option is different than just a firewall rule, it blocks actually client to client communication on the same subnet for wireless devices, this cannot be accomplished with firewall rules.

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Yes, guest wifi comes with AP isolation as well.

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