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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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Overview of IPSG

Overview of IPSG


IP Source Guard (IPSG) implements source IP address filtering based on Layer 2 interfaces to prevent malicious hosts from posing as authorized hosts by using authorized hosts' IP addresses. In addition, IPSG prevents unauthorized hosts from accessing or attacking networks with the IP addresses configured by themselves.


As networks continue to increase in scale, many attackers are forging source IP addresses to initiate network attacks (IP address spoofing attacks). Some attackers steal the IP addresses of authorized users to obtain network access rights and access networks. As a result, authorized users are unable to access networks or sensitive information may be intercepted. IPSG provides a mechanism to effectively defend against IP address spoofing attacks.

Figure 14-1 illustrates how IPSG defends against attacks. A malicious host steals an authorized host's IP address to obtain network access rights. IPSG is configured on the device's user-side interface or VLAN, so the device checks the IP packets received by the interface and discards the packets from malicious hosts to prevent IP address spoofing attacks.

Figure 14-1  IPSG is enabled on the network

Updated: 2019-08-07

Document ID: EDOC1100034077

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