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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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Address Spoofing Attack Defense

Address Spoofing Attack Defense

As shown in Figure 10-1, an attacker uses the address of user A to send an NA/NS/RS packet to the gateway. The gateway records an incorrect mapping for the address of user A in the ND entries. Then the attacker obtains the data sent from the gateway to user A. In addition, the attacker uses the address of gateway to send an NA/NS/RS packet to user A. User A records an incorrect mapping for the gateway. Then the attacker obtains the data sent from user A to the gateway. As a result, user A cannot receive valid packets and data of user A may be leaked.

Figure 10-1  Defense against address spoofing attacks

To prevent address spoofing attacks, configure ND snooping on interface 1 and interface 3 of the Switch. Configure interface 3 that connects to the gateway as the trusted interface and enable ND packet validity check on interface 1 that connects to users. When receiving NA/NS/RS packets from interface 1, the Switch checks packet validity against the dynamic ND snooping binding table and filters out forged NA/NS/RS packets.

Updated: 2019-04-01

Document ID: EDOC1000178319

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