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Configuration Guide - IP Service

CloudEngine 12800 and 12800E V200R005C00

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 Data Planning Guide

DHCPv6 Data Planning Guide

Server Planning

DHCPv6 Request messages are broadcast to DHCPv6 servers. If multiple DHCP servers (relay agents in a DHCPv6 relay scenario) exist on the same network segment, the obtained IPv6 address may not be assigned by the desired DHCPv6 server because clients select the DHCPv6 server that returns an Advertise message first. Proper server planning can ensure that a client applies for network parameters from the desired DHCPv6 server.

When planning DHCPv6 servers, you need to properly plan VLAN resources, so that only one DHCPv6 server (relay agent in a DHCPv6 relay scenario) can receive DHCPv6 Request messages sent by clients in the same VLAN.

IPv6 Address Planning

  • Range of the IPv6 addresses that can be automatically assigned by a DHCPv6 server

    Properly configure the range of the IPv6 addresses that can be automatically assigned by a DHCPv6 server based on the number of concurrent online users. If IPv6 addresses that can be automatically assigned are insufficient, some clients cannot obtain an IPv6 address. However, if IPv6 addresses that can be automatically assigned are excessive, address resources are wasted.

  • (Optional) IPv6 addresses that cannot be automatically assigned

    You may need to reserve some IPv6 addresses for devices that require static address assignment such as servers. For example, in an IPv6 address pool from 2001:db8::1 to 2001:db8::ffff, the IPv6 address 2001:db8::2 needs to be statically assigned to the DNS server. Exclude 2001:db8::2 from the address pool so that it cannot be assigned to clients by the DHCPv6 server.

  • IPv6 address assignment mechanism

    DHCPv6 supports two IP address assignment mechanisms. Choose one mechanism based on actual needs:

    • Dynamic address assignment: IPv6 addresses with a limited validity period (called lease) are assigned to clients through DHCPv6. This mechanism applies to scenarios in which hosts need to be temporarily connected to a network or the number of idle IPv6 addresses is less than the total number of hosts and permanent connection is not needed.

    • Static address allocation: Fixed IPv6 addresses are statically assigned to specified hosts through DHCPv6. This mechanism applies to hosts that have special requirements for IPv6 addresses. For example, you need to assign a fixed IPv6 address to the enterprise file server that provides services to users from an external network. Compared with manual IP address configuration, DHCPv6 static assignment prevents manual configuration errors and helps you perform unified maintenance and management.

Planning of Other Network Parameters

In addition to assigning IPv6 addresses to clients, a DHCPv6 server assigns other network parameters to clients. You can configure a DHCPv6 server to assign other network parameters as required. For example, if clients need to communicate with other devices using domain names and expect to obtain DNS service parameters through DHCPv6, configure the DHCPv6 server to assign the IPv6 address of the DNS server and client domain names to the clients.

Lease Planning

Properly set the lease period based on the online time of clients. By default, the lease period of an IPv6 address is two days.

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Updated: 2019-04-18

Document ID: EDOC1100039535

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