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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).
icmp ttl-exceeded send

icmp ttl-exceeded send

Function

The icmp ttl-exceeded send command enables an interface to send ICMP Time Exceeded messages.

The undo icmp ttl-exceeded send command disables an interface from sending ICMP Time Exceeded messages.

By default, an interface is enabled to send ICMP Time Exceeded messages.

Format

icmp ttl-exceeded send

undo icmp ttl-exceeded send

Parameters

None

Views

VLANIF interface view, loopback interface view

Default Level

2: Configuration level

Usage Guidelines

By default, an interface replies with an ICMP Time Exceeded message after it receives a message with TTL 1. The interface adds its IP address as the source IP address in the ICMP Time Exceeded message, exposing the interface itself to attackers. In addition, after being attacked, the interface replies with numerous ICMP Time Exceeded messages, consuming CPU resources and degrading system performance. To resolve these problems, run the undo icmp ttl-exceeded send command to disable the interface from replying with ICMP Time Exceeded messages.

Example

# Disable VLANIF 10 from sending ICMP Time Exceeded messages.
<Huawei> system-view
[Huawei] interface vlanif 10
[Huawei-Vlanif10] undo icmp ttl-exceeded send
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Updated: 2019-07-18

Document ID: EDOC1100064353

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