Configuration Guide DHCPv6 Configuration
DHCPv6 Configuration
DHCPv6 Overview
Along with the development of IPv6 network, IPv6-based network is being applied more and
more widely. As the framework proposed at the beginning of IPv6 design, the automatic
configuration of network nodes has become a key feature of IPv6 network. In the new network
framework, the concepts of stateless configuration and stateful configuration were brought
forward. Through stateless auto-configuration, the new nodes in the network can complete all
configurations via Route Advertisement; while in stateful auto-configuration, the network nodes
need interact with relevant configuration server in the network in order to complete the
configuration of network address and other parameters. As the only stateful configuration model
developed at the present time, DHCPv6 is fully described in RFC3315.
Comparatively complete description on the application model of DHCPv6 has been given in
RFC3315 (Dynamic Host Configuration Protocol for IPv6). Similar to the framework of
sDHCPv4, the application model of DHCPv6 is composed of the DHCP server, DHCP clients
and DHCP relay. The configuration parameters can be obtained through the interaction
between DHCP clients and DHCP server, while the DHCP relay can link the DHCP clients with
the DHCP server outside the local link. The message interaction and parameter maintenance
basically follow the practices of DHCPv4, but DHCPv6 do give proper consideration to the
message structure and process according to the new network.
In IPv6 network, the auto-configuration of network nodes can be divided into:
Stateless auto-configuration: Network nodes will acquire configuration parameters from route
advertisement.
Stateful auto-configuration: Network nodes will acquire configuration parameters from the
DHCPv6 server.
Fig 1 DHCPv6 stateful auto-configuration
As shown in the above figure, the new network node (host or interface) will send a multicast
message (Solicit) to all the DHCPv6 servers and DHCPv6 relays in the local link (address:
FF02::1:2; port: 547), and the DHCPv6 servers will send the unicast Advertise reply message
after receiving such message. After selecting the DHCP server, the DHCP clients will send the
To Next Page
Loading...
