No relevant resource is found in the selected language.

This site uses cookies. By continuing to browse the site you are agreeing to our use of cookies. Read our privacy policy>Search

Reminder

To have a better experience, please upgrade your IE browser.

upgrade

Configuration Guide - Security

S1720, S2700, S5700, and S6720 V200R011C10

This document describes the configurations of Security, including 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, MPAC, separating the management plane from the service plane, security risks, PKI.
Rate and give feedback:
Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
(Optional) Disabling Location Transition for DHCP Snooping Users

(Optional) Disabling Location Transition for DHCP Snooping Users

Context

When a mobile user connects to the network through interface A, and then reconnects through interface B, the user sends a DHCP Discover message to reapply for an IP address. By default, if DHCP snooping is enabled on the device, the device allows the user to go online and updates the DHCP snooping binding entries. However, this may bring security risks. For example, if an attacker pretends to be an authorized user and sends a DHCP Discover message, the authorized user is disconnected after the DHCP snooping binding table is updated. To prevent such attacks, disable the DHCP snooping location transition function, after which the device discards the DHCP Discover messages sent by a user who has an entry in the DHCP snooping binding table (the user whose MAC address exists in the DHCP snooping binding table) if the packet is sent through another interface.

NOTE:

Interface A and interface B must belong to the same VLAN.

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run undo dhcp snooping user-transfer enable

    Location transition is disabled for DHCP snooping users.

    By default, location transition is enabled for DHCP snooping users.

Translation
Download
Updated: 2019-09-23

Document ID: EDOC1000178177

Views: 233522

Downloads: 750

Average rating:
This Document Applies to these Products
Related Documents
Related Version
Share
Previous Next