SonicOS 7.1 Objects

ICMP Flood Protection

ICMP Flood Protection functions similar to UDP Flood Protection, except it monitors for ICMPv4/ICMPv6 Flood Attacks. The only difference is that DNS queries are not allowed to bypass ICMP Flood Protection.

To configure ICMP Flood Protection

  1. Navigate to OBJECT | Action Profiles > DoS Action Profile.
  2. Do one of the following:

    • Add a new DoS Action Profile.

      1. Click the Add icon.
      2. Enter a friendly DoS Rule Action Name.
    • Edit an existing DoS Action Profile.

      Hover over an existing DoS Action Profile and click the Edit icon.

  3. Click Flood Protection > ICMP Flood Protection option.

  4. Enable ICMP Flood Protection to enable ICMP flood protection and enable the other ICMP Flood Protection options.
  5. Make the necessary changes to the default values.

    ICMP Flood Attack Threshold

    The maximum number of ICMP packets allowed per second to be sent to a host, range, or subnet.

    The minimum number is 10, the maximum number is 100000, and the default number is 200.

    ICMP Flood Attack Blocking Time

    After the appliance detects the rate of ICMP packets exceeding the attack threshold for this duration of time, ICMP Flood Protection is activated, and the appliance begins dropping subsequent ICMP packets.

    The minimum time is 1 second, the maximum time is 120 seconds, and the default time is 2 seconds.

  6. Click Save.
  7. Click Cancel to go back to the DoS Action Profile page or proceed with other configurations.

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