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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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DHCP Client Reuse of an IP Address

DHCP Client Reuse of an IP Address

If a DHCP client reconnects to a network, it may be able to reuse an IP address that has been previously allocated to it. If a DHCP relay agent is deployed, the DHCP relay agent processes DHCP messages. For more details, see DHCP Server Allocating Network Parameters to New DHCP Clients.

Not all clients can reuse IP addresses that have been allocated to them. Figure 3-6 uses a PC as the DHCP client to describe how the DHCP client reuses an IP address.

The DHCP client exchanges DHCP messages with a DHCP server to obtain the network parameters, including the IP address that has been allocated to it.

Figure 3-6  Message exchange for IP address reuse between a DHCP client and server

  1. The DHCP client broadcasts a DHCP Request message carrying the IP address that the client has previously used. The requested IP address is added in the Option 50 field.

  2. After receiving the DHCP Request message, the DHCP server checks whether there is a lease record based on the MAC address in the message. If there is a lease record matching the MAC address, the DHCP server replies with a DHCP ACK message to notify the DHCP client that the requested IP address can be used. Otherwise, the DHCP server performs no operation and waits for a new DHCP Discover message from the client.

Updated: 2018-12-24

Document ID: EDOC1100038342

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