ZyXEL Communications VPN Series Handbook page 592

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Set Up the IP Blocking on the ATP series
Go to Configuration > Security Service > Botnet Filter.
Select the Enable IP Blocking check box. There're some actions can be selected
"reject-both", user can decide if they'd like to "forward", "reject-sender" or "reject-
receiver" the blocked IP . In addition, users can select if they want to log the related
events or not.
Test the Result
User access IP: 5.9.32.230
Go to Monitor > Security Statistics > Botnet Filter to check summary.
IP: 5.9.32.230 is blocked due to command & control.
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