HP-UX IP Address and Client Management Administrator's Guide HP-UX 11i v2, HP-UX 11i v3

6. The DHCP server sends a DHCPACK packet to extend the lease on the IP address.
DHCPv6 Overview
Dynamic Host Configuration Protocol (DHCP) is an extension of BOOTP that defines a protocol
for passing configuration information to hosts on a network. DHCPv6 supports IPv6, the
next-generation Internet protocol. DHCPv6 enables DHCP servers to transmit configuration
parameters using extensions to IPv6 nodes. It automatically allocates reusable network addresses
and reduces the cost of managing IPv6 nodes in environments where administrators require
more control over the allocation of IP addresses. DHCPv6 manages network resources such as
IP addresses, Network Time Protocol (NTP), Domain Name System (DNS), and other server
addresses at a centralized location.
NOTE: All references to DHCPv6 in this document refers to DHCPv6 2.001
This section discusses the following topics:
• “DHCPv6 Components” (page 47)
• “Autoconfiguration” (page 47)
• “Ports” (page 47)
• “Multicast Addresses” (page 48)
DHCPv6 Components
Table 1-17 describes the components that the DHCPv6 framework includes.
Table 1-17 DHCPv6 Components
DescriptionComponent
The host that needs to be configured.DHCP client
The server that caters to the DHCP client’s configuration requirements.DHCP server
The host that facilitates initial communication between the DHCP server
and the client when they are on different links.
DHCP relay or agent
Autoconfiguration
Autoconfiguration is a mechanism that does not require any manual intervention to configure
a host in a network environment.
Following are the types of autoconfiguration methods:
• Stateless address autoconfiguration
Stateless autoconfiguration does not require a manually configured server but enables IPv6
hosts to configure their own addresses using a local IPv6 router. This method is easy to use.
However, this autoconfiguration method lacks network access control capabilities and
manages only addresses. It does not make the optimum use of the available address space.
• Stateful address autoconfiguration
Stateful autoconfiguration involves a client and a server. An unconfigured node checks for
router advertisements on the network. If there are no router advertisements on the network,
the node determines that it needs to use DHCPv6 to configure an interface.
DHCPv6 does not require a DHCPv6 server on each link. It works across relays.
Ports
DHCPv6 uses the following Internet User Datagram Protocol (UDP) ports:
DHCPv6 Overview 47