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Configuration Guide - Security

CloudEngine 8800, 7800, 6800, and 5800 V200R005C10

This document describes the configurations of Security, including ACL, local attack defense, MFF, attack defense, traffic suppression and storm control, ARP security, Port security, DHCP snooping, ND snooping, PPPoE+, IPSG, SAVI, separating the management plane from the service plane, security risks.
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Configuring Defense Against Packet Fragment Attacks

Configuring Defense Against Packet Fragment Attacks


Packet fragment attacks include attacks from many fragments, attacks from many packets with offsets, attacks from repeated packet fragments, Tear Drop attacks, Syndrop attacks, NewTear attacks, Bonk attacks, Nesta attacks, Rose attacks, Fawx attacks, Ping of Death attacks, and Jolt attacks. If an attacker sends error packet fragments to a device, the device consumes a large number of resources to process the error packet fragments, affecting normal services.

To prevent the system from breaking down and to ensure normal network services, enable defense against packet fragment attacks on the device. The device then limits the rate of fragment packets to ensure that the CPU runs properly when the device is being attacked by many packet fragments.


  1. Run system-view

    The system view is displayed.

  2. Run anti-attack fragment enable

    Defense against packet fragment attacks is enabled.

    By default, defense against packet fragment attacks is enabled.

    You can also run the anti-attack enable command in the system view to enable attack defense against all attack packets including packet fragments.

  3. Run anti-attack fragment car cir cir

    The rate limit of packet fragments is set.

    By default, the rate limit of packet fragments is 155000000 bit/s.

  4. Run commit

    The configuration is committed.

Verifying the Configuration

  • Run the display anti-attack statistics fragment command to check statistics on defense against packet fragment attacks on the device.

Updated: 2019-04-20

Document ID: EDOC1100074765

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