Configuration of IP sweep attack defense for the USG2000&5000 series on the CLI

You can configure IP sweep attack defense for the USG2000&5000 series on the CLI.

1. Run the firewall defend ip-sweep enable command to enable IP sweep attack defense.
By default, IP sweep attack defense is disabled.
2. Run the firewall defend ip-sweep max-rate max-rate-number command to set the IP sweep maximum connection rate.
The default maximum connection rate is 4000 pps.
3. Run the firewall defend ip-sweep blacklist-timeout interval command to set the blacklist aging time.
By default, the blacklist aging time is 20 minutes.
4. Run the firewall blacklist enable command to enable the blacklist function.

After IP sweep attack defense is enabled, the device checks received TCP, UDP, and ICMP packets. If the number of packets that a source address sends per second to different destination IP addresses exceeds the specified threshold, the USG2000&5000 considers that the source address is initiating an IP sweep attack. It blacklists the IP address and:
Discards the packets from the source address if the blacklist function is enabled.
Forwards the packets from the source address and generates an alarm if the blacklist function is disabled.

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