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NE20E-S2 V800R010C10SPC500 Configuration Guide - IP Services 01

This is NE20E-S2 V800R010C10SPC500 Configuration Guide - IP Services
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Overview of DHCP

Overview of DHCP

DHCP enables a client to dynamically obtain a valid IP address from a server.


The Dynamic Host Configuration Protocol (DHCP) dynamically assigns IP addresses to hosts and centrally manages host configurations. DHCP uses the client/server model. A client applies to the server for configuration parameters, such as an IP address, subnet mask, and default gateway address; the server replies with the requested configuration parameters.

DHCP involves the following roles:
  • DHCP client

    A DHCP client exchanges messages with a DHCP server to obtain an IP address and other configuration parameters. A device interface can function as a DHCP client to dynamically obtain configuration parameters from a DHCP server. This facilitates configuration and centralized management.

  • DHCP relay agent

    A DHCP relay agent forwards DHCP messages exchanged between a DHCP client and a DHCP server that are located on different network segments, allowing them to complete their address configuration. The use of a DHCP relay agent eliminates the need for deploying a DHCP server on each network segment. This reduces network deployment costs and facilitates device management.

    DHCP relay agents are not mandatory in the DHCP architecture. A DHCP relay agent is required only when the server and client are located on different network segments.
  • DHCP server
    A DHCP server processes address allocation, lease extension, and address release requests originating from a DHCP client or forwarded by a DHCP relay agent and assigns IP addresses and other configuration parameters to the client.
    To protect a DHCP server against network attacks, such as man-in-the-middle attacks, starvation attacks, and DoS attacks by changing the CHADDR value, configure DHCP snooping on the intermediate device directly connecting to a DHCP client to provide DHCP security services.
Updated: 2019-01-02

Document ID: EDOC1100055376

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