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Configuration Guide - Security

S7700 and S9700 V200R011C10

This document describes the configurations of Security, including ACL, reflective ACL, local attack defense, MFF, attack defense, traffic suppression and storm control, ARP security, port security, DHCP snooping, ND snooping, PPPoE+, IPSG, SAVI, URPF, keychain, separating the management plane from the service plane, security risks.
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Overview of IPSG

Overview of IPSG


IP Source Guard (IPSG) implements source IP address filtering based on Layer 2 interfaces. IPSG is used to prevent network access from malicious hosts using stolen IP addresses. In addition, IPSG prevents unauthorized hosts from accessing or attacking networks with forged IP addresses.


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 12-1 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 Switch's user-side interface or VLAN. With this configuration, the Switch checks the IP packets received by the interface and discards the packets from malicious hosts to prevent IP address spoofing attacks.

Figure 12-1  IPSG is enabled on the network

Updated: 2019-10-18

Document ID: EDOC1000178319

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