DHCPv6 Prefix Delegation Configuration
Overview
The prefix delegation feature lets a DHCP server assign prefixes chosen from a global pool to DHCP clients, that is how the Customer Premise Equipment (CPE) learns the prefix. The learnt prefix shall be used by the user to configure the IPv6 address on its LAN interface along with the subnet prefix. The LAN hosts are learning the subnetted prefix through router advertisement (NDP protocol) messages, which enables the device to auto-configure its own IPv6 addresses.
This feature would enable service providers to assign IP for the Customer Premise Equipment acting as a router between the service providers core network and subscribers internal network.
Description
• DHCPv6 IA_NA is used to assign a global IPv6 address on the WAN link. The address comes from a local pool specified in DHCP Server.
• The Requesting Router(RR) uses the delegated prefix to define the subnet for the LAN based on the prefix received from DHCP Server.
• The Requesting Router uses the delegated prefix to assign addresses to the LAN devices. Here RR can send Router Advertisement, or the devices shall send Router solicitation.
Acronyms
Field | Description |
|---|
IA_NA | Identity association for non-temporary addresses |
NDRA | Neighbor discovery Router Advertisement |
CPE | Customer Premises Equipment |
BNG | Border Network Gateway |
DR | Delegating Router |
RR | Requesting Router |
RA | Router Advertisement |
RS | Router Solicitation |
Last modified date: 10/19/2023