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CLI-based Configuration Guide - Security

AR100, AR120, AR150, AR160, AR200, AR1200, AR2200, AR3200, and AR3600 V200R010

This document provides the basic concepts, configuration procedures, and configuration examples in different application scenarios of the network management feature supported by the device.
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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).
Overview of URPF

Overview of URPF

Definition

Unicast Reverse Path Forwarding (URPF) prevents network attacks based on source IP address spoofing.

Purpose

A Denial of Service (DoS) attack disables users from connecting to the server. DoS attacks aim to occupy excess resources by sending a large number of connection requests. As a result, authorized users cannot receive responses from the server.

URPF searches the outbound interface in the FIB table according to the source IP address of the packet, and checks whether the outbound interface matches the source interface of the packet. If the source IP address does not match the outbound interface of the packet, the packet is discarded. This prevents IP spoofing attacks, especially DoS attacks with bogus source IP address.

Benefits

  • URPF prevents source IP address spoofing attacks and reduces maintenance costs.

  • URPF improves network security and stability and defends against malicious attacks.

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Updated: 2019-08-07

Document ID: EDOC1100034077

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