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

1. The client sends a DHCP SOLICIT message to the ALL DHCP Agents address to locate
servers that are able to offer the required services.
2. The relay forwards the client’s message to servers by sending RELAY-FORW messages. The
client message is encapsulated in the RELAY-FORW message.
3. Servers respond to the client’s message by sending a RELAY-RELAY message. The server
message is encapsulated in the RELAY-RELAY message.
4. The relay forwards the server message to the client’s message by sending ADVERTISE
messages.
NOTE: All other message interactions are identical to those explained in the previous
scenario.
Identifying and Managing IPv6 Addresses
Servers and clients manage IPv6 addresses in groups called Identity Associations (IAs). A unique
identifier identifies each IA. DHCPv6 servers allocate IPv6 addresses to clients as IAs. Clients
use the addresses in an IA to configure interfaces. Each address in an IA has its own preferred
and valid lifetimes.
DHCPv6 Features
This section describes the features that the DHCPv6 software supports. It discusses the following
topics:
• “Message Types” (page 50)
• “Multiple IP Address Request” (page 51)
• “Configuration Parameters from a DHCPv6 Server” (page 51)
• “Reconfiguration Messages” (page 51)
Message Types
Table 1-18 describes the messages exchanged between the client and the server through a relay.
Table 1-18 DHCPv6 Message Types
DescriptionMessage Type
A client uses this message to locate servers.
SOLICIT
A server uses this message to respond to SOLICIT messages.ADVERTISE
A client uses this message to request addresses and configuration
parameters from servers.
REQUEST
A client sends a CONFIRM message to any available server to
determine whether the addresses it was assigned are still
appropriate to the link to which the client is connected.
CONFIRM
A client uses this message to renew addresses from the server when
the lease on an identify association (IA) is about to expire.
RENEW
A client uses this message to renew addresses from all available
DHCPv6 servers when the lease on an IA is about to expire.
REBIND
A server sends a REPLY message containing assigned addresses
and configuration parameters in response to a SOLICIT, REQUEST,
RENEW, REBIND message received from a client. A server sends a
REPLY message containing configuration parameters in response
to an INFORMATION-REQUEST message. A server sends a REPLY
message in response to a CONFIRM message confirming or denying
that the addresses assigned to the client are appropriate to the link
to which the client is connected. A server sends a REPLY message
to acknowledge receipt of a RELEASE or DECLINE message.
REPLY
50 Overview