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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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Enabling DHCP Server Detection

Enabling DHCP Server Detection

Context

After DHCP snooping is enabled and a trusted interface is configured, the device ensures DHCP clients obtain IP addresses from the authorized DHCP server, preventing attacks from bogus DHCP servers. However, the location of the bogus DHCP server cannot be detected, meaning the network security is still at risk.

After DHCP server detection is enabled, the DHCP snooping-enabled device checks information about the DHCP server, such as its IP address and connecting port number, in the DHCP Reply messages and records the information in the log. You can refer to these logs to check whether bogus DHCP servers exist on the network.

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run dhcp server detect

    DHCP server detection is enabled.

    By default, detection of DHCP servers is disabled.

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Updated: 2019-10-18

Document ID: EDOC1000178319

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