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Fit AP V200R010C00 Command Reference

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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
anti-attack tcp-syn enable

anti-attack tcp-syn enable

Function

The anti-attack tcp-syn enable command enables defense against TCP SYN flood attacks.

The undo anti-attack tcp-syn enable command disables defense against TCP SYN flood attacks.

The anti-attack tcp-syn disable command disables defense against TCP SYN flood attacks.

By default, defense against TCP SYN flood attacks is enabled.

Format

anti-attack tcp-syn enable

undo anti-attack tcp-syn enable

anti-attack tcp-syn disable

Parameters

None

Views

System view

Default Level

2: Configuration level

Usage Guidelines

Usage Scenario

An attacker sends a SYN packet to the target host to initiate a TCP connection but does not respond to the SYN-ACK sent from the target host. If the target host receives no ACK packet from the attacker, the device keeps waiting for the ACK packet. A half-open connection is formed. The attacker keeps sending SYN packets, so many half-open connections are set up on the target host. This wastes a large number of resources. To prevent TCP SYN flood attacks, run the anti-attack tcp-syn enable command to enable defense against TCP SYN flood attacks.

The device detects TCP SYN flood attack packets after defense against TCP SYN flood attacks is enabled. If the device detects TCP SYN flood attack packets, the device limits the rate of these TCP SYN flood attack packets to ensure that the device CPU works properly.

Precautions

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

Example

# Enable defense against TCP SYN flood attacks.

<Huawei> system-view
[Huawei] anti-attack tcp-syn enable
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Updated: 2019-07-18

Document ID: EDOC1100064353

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