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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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Why Can't a PC Access the Internet after Obtaining an IP Address Through DHCP

Why Can't a PC Access the Internet after Obtaining an IP Address Through DHCP

In normal situations, a PC can access the Internet after obtaining an IP address through DHCP. However, if the IP address is assigned by a bogus DHCP server, the PC cannot access the Internet with the bogus IP address. If this problem occurs, you are advised to configure DHCP snooping on the Layer 2 access device or first DHCP relay agent from the device, to ensure that PCs can obtain correct IP addresses.

  • When you configure DHCP snooping on a Layer 2 access device, steps 1, 2, and 3 are mandatory and must be performed in sequence.

  • When you configure DHCP snooping on a DHCP relay agent, only steps 1 and 2 are required.

  1. Enable DHCP snooping globally.

    <HUAWEI> system-view
    [HUAWEI] dhcp enable
    [HUAWEI] dhcp snooping enable
  2. Configure the interfaces connected to DHCP clients. Perform the configuration on all interfaces connected to DHCP clients. GE1/0/0 is used as an example.

    [HUAWEI] interface gigabitethernet 1/0/0
    [HUAWEI-GigabitEthernet1/0/0] dhcp snooping enable
    [HUAWEI-GigabitEthernet1/0/0] quit
  3. Perform the configuration on interfaces connected to the DHCP server. GE2/0/0 is used as an example.

    [HUAWEI] interface gigabitethernet 2/0/0
    [HUAWEI-GigabitEthernet2/0/0] dhcp snooping trusted
    [HUAWEI-GigabitEthernet2/0/0] quit
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Updated: 2019-10-18

Document ID: EDOC1000178319

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