IPv6 Prefix Delegation, also known as DHCPv6 Prefix Delegation (DHCPv6-PD), is an extension to DHCPv6. In DHCPv6, addresses are assigned by a DHCPv6 server to an IPv6 host. In DHCPv6-PD, complete IPv6 subnet addresses and other parameters are assigned by a DHCPv6-PD server to a DHCPv6-PD client.
When DHCPv6-PD is enabled, it is applied to all DHCPv6 interfaces attached to the WAN zone. DHCPv6-PD is an additional subnet-configuration mode that co-exists with DHCPv6.
The IPv6 address is a combination of the prefix provided by the DHCPv6-PD server and the suffix provided by the DHCPv6-PD client. The prefix length is 64 by default, but can be edited.
When the firewall starts, a default address object group called Prefixes from DHCPv6 Delegation is automatically created. Prefixes delegated from the upstream interface are members of this group.
IPv6 Prefix Delegation is configured on:
When the upstream interface learns the prefix delegation from the DHCPv6-PD server, SonicOS calculates and applies the IPv6 address prefixes to all the downstream interfaces, and the downstream interfaces advertise this information to all the hosts in their network segments.
This section contains the following configuration procedures:
