ZyXEL Communications XGS4600 Series - Page 182

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4 Go to Advance Application > IP Source Guard > IPv4 Source
Guard Setup > DHCP Snooping > Configure. Check the Active
box under DHCP Snooping Configure. Click Apply.
5 Go to Advance Application > IP Source Guard > IPv4 Source
Guard Setup > DHCP Snooping > Configure > Port. Set all
access ports as untrusted ports. Ports to the USG or other
network components should be trusted ports. Click Apply.