ZyXEL Communications VPN Series Handbook page 589

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How to Configure Botnet Filter on ATP series?
Botnets are organized groups of infected computers. Those infected PCs will try
to connect to the command-and-control server and ask for commands.
When the attacker sends command to the command-and-control server, it will
relay those commands to the clients (infected computers) and perform attacks
on particular targets.
The following steps will walk you through an example of how to configure
Botnet Filter (IP blocking and URL blocking) on the ATP.
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