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Configuration Guide - IP Service

S1720, S2700, S5700, and S6720 V200R012(C00 and C20)

This document describes the configurations of IP Service, including IP address, ARP, DHCP, DHCP policy VLAN, DNS, mDNS gateway, mDNS relay, UDP Helper, IP performance optimization, IPv6, DHCPv6, IPv6 DNS, IPv6 over IPv4 tunnel, and IPv4 over IPv6 tunnel.
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Typical Networking of DHCP

Typical Networking of DHCP

Figure 3-3 shows the typical DHCP networking.

Figure 3-3  DHCP networking

The following roles are involved on a typical DHCP network:

  • DHCP client: applies for network parameters including IP addresses through DHCP. A DHCP client can be an IP phone, PC, mobile phone, or diskless workstation.

  • DHCP server: allocates network parameters to DHCP clients.

  • (Optional) DHCP relay agent: forwards DHCP messages between a DHCP server and DHCP clients and helps the DHCP server to dynamically allocate network parameters to the DHCP clients.

    When a DHCP client broadcasts DHCP Discovery messages with the destination IP address 255.255.255.255, only the DHCP server on the same network segment as the DHCP client can receive the messages. If a DHCP server is on a different network segment from the DHCP client, a DHCP relay agent must be deployed to forward DHCP Discovery messages to the DHCP server. The DHCP relay agent modifies the format of a DHCP Discovery or Offer message to generate a new DHCP message and then forwards it.

    A DHCP relay agent is required in scenarios where terminals on an enterprise network are located on multiple network segments and need to obtain network parameters through DHCP. This enables the terminals to communicate with one DHCP server, saving server resources and facilitating unified management.

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Updated: 2018-12-24

Document ID: EDOC1100038342

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