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NE20E-S2 V800R010C10SPC500 Configuration Guide - Security 01

This is NE20E-S2 V800R010C10SPC500 Configuration Guide - Security
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Overview of DHCP Snooping

Overview of DHCP Snooping

This section describes the basic concepts of Dynamic Host Configuration Protocol (DHCP) snooping.

Dynamic Host Configuration Protocol (DHCP) snooping is a DHCP security feature that functions in a similar way to a firewall between DHCP clients and servers. A DHCP-snooping-capable device intercepts DHCP packets and uses information carried in the packets to create a DHCP snooping binding table. This table records hosts' media access control (MAC) addresses, IP addresses, IP address lease time, virtual local area network (VLAN) IDs, and interface information. The device uses this table to check the validity of received DHCP packets. If a DHCP reply packet is received from an untrusted interface, the device discards the packet. In addition, DHCP snooping can associate with IP source guard or dynamic ARP inspection (DAI) to filter out IP and Address Resolution Protocol (ARP) packets from unauthorized clients.

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Updated: 2019-01-02

Document ID: EDOC1100055397

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