ZyXEL – UAG Support Notes
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Step 2: Since the Layer2 Isolation function only takes effect if the firewall is enabled,
therefore, you have to enable firewall first.
Configuration > Network > Firewall > Enable Firewall
Step 3: Configuration > Network > Layer 2 Isolation
(1) Enable Layer 2 Isolation.
(2) Move the lan1 interface to the member list to prevent all lan1 internal users from
connecting to each other.