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DES-7200 Configuration Guide Chapter 8 DHCPv6 Client Configuration
8-4
IPv6 multi-service router enables auto-configuration on the interface connecting
to the desktop computer and runs interface-based router advertisement or
address assignment (NA) based DHCPv6 server.
The desktop computer completes address and parameter configuration via ND
or address assignment (NA) based DHCPv6 client.
In the above model, DHCPv6 fulfils the following functions:
The DHCP client (host, node) sends out prefix delegation (PD) based multicast
solicit message within the link to look for DHCPv6 servers.
The DHCP servers will send unicast advertisement message to the DHCP client
after receiving such solicitation message.
The DHCP client will select one server and send a multicast request message.
The DHCP server will then send a unicast reply message to complete address
assignment.
8.1.2 Introduction to the
DHCPv6 Client
The DHCPv6 client can automatically acquire prefix space and other configuration
parameters from the DHCPv6 server. After obtaining the prefix space, the DHCP
client will store it in the global prefix space pool of IPv6, and then such prefix space
can be assigned to other interfaces via prefix partition for prefix advertisement.
The DHCPv6 client gets relevant parameters based on interface, such as Domain
Name Server, SNTP server. Relevant parameters configurations depend on the
validity of interface.
8.1.3 Introduction to the
DHCPv6 Relay
The DHCPv6 relay forwards DHCPv6 messages between the DHCPv6 server and
the DHCP client. When the DHCP server and the DHCP client are not in the same
physical network, the DHCP relay is responsible for forwarding the DHCP solicit and
reply messages. The forwarding process is different from routing forwarding, which
features transparent transmission. Generally, the router will not modify the contents
of IP packets. Upon receiving the DHCP message, the DHCP relay will regenerate
and forward another one.
The DHCP relay is just like a DHCP server for the DHCP clients and a DHCP client
for the DHCP server.