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


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


Configuration Guide - Security

CloudEngine 8800, 7800, 6800, and 5800 V200R005C10

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, separating the management plane from the service plane, security risks.
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).
Defense Against Bogus DHCP Message Attacks

Defense Against Bogus DHCP Message Attacks


An authorized DHCP client that has obtained an IP address sends a DHCP Request message or Release message to extend the lease or to release the IP address. If attackers continuously send DHCP Request messages to the DHCP server to extend the lease, the IP addresses cannot be reclaimed or obtained by authorized users. If attackers forge DHCP Release messages of authorized users to the DHCP server, the authorized users may be disconnected.


To prevent bogus DHCP message attacks, use the DHCP snooping binding table. The device checks DHCP Request messages and Release messages against binding entries to determine whether the messages are valid. (The device checks whether the VLAN IDs, IP addresses, MAC addresses, and interfaces in messages match binding entries.) If a message matches a binding entry, the device forwards the message; if a message does not match a binding entry, the device discards the message.

Updated: 2019-04-20

Document ID: EDOC1100074765

Views: 22408

Downloads: 92

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