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Configuration Guide - IP Service

CloudEngine 8800, 7800, 6800, and 5800 V200R003C00

This document describes the configurations of IP Service, including IP address, ARP, DHCP, DNS, IP performance optimization, IPv6, DHCPv6, and IPv6 DNS.
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DHCPv6 Server Allowing DHCPv6 Clients to Reuse Addresses

DHCPv6 Server Allowing DHCPv6 Clients to Reuse Addresses

If a DHCPv6 client connects to the network again (for example, the DHCPv6 client restarts after power-off or network adapter disabling, or connects to the DHCPv6 server through a new link), it can reuse an IPv6 address that has been allocated to it. The following describes how a DHCPv6 server allows a DHCPv6 client to reuse an IPv6 address when no DHCPv6 relay agent exists on the network. If a DHCPv6 relay agent exists, the only difference is that the DHCPv6 relay agent processes DHCPv6 messages. For details, see DHCPv6 Server Allocating Addresses and Network Configuration Parameters to New Clients.

Figure 8-9 A DHCPv6 server allows DHCPv6 clients to reuse addresses

  1. If a DHCPv6 client connects to the network again (for example, the DHCPv6 client restarts after power-off or network adapter disabling, or connects to the DHCPv6 server through a new link), the DHCPv6 client sends a multicast Confirm message to check whether it can still use the allocated IPv6 address.
  2. After a DHCPv6 server receives the Confirm message, the DHCPv6 server checks whether all addresses carried in the Confirm message apply to the current link of the DHCPv6 client. If all addresses pass the check, the DHCPv6 server sends a Reply message to inform the DHCPv6 client that the confirmation succeeds. If any address fails to pass the check, the DHCPv6 server sends a Reply message to inform the DHCPv6 client that the confirmation fails.
  3. If the DHCPv6 client receives the Reply message indicating failed confirmation, the DHCPv6 client sends a Solicit message to request an IPv6 address again. If the DHCPv6 client receives the Reply message indicating successful confirmation, the DHCPv6 client reuses the IPv6 address that has been allocated to it.
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Updated: 2019-05-08

Document ID: EDOC1100004354

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