HP VPN Firewall Appliances Network Management Configuration Guide

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For more information about the valid lifetime and the preferred lifetime, see "Configuring IPv6 basics."
Stateless DHCPv6 configuration
After obtaining an IPv6 address/prefix, a device can use stateless DHCPv6 to obtain other configuration
parameters from a DHCPv6 server. This application is called stateless DHCPv6 configuration.
With an IPv6 address obtained through stateless address autoconfiguration, a device automatically
enables the stateless DHCPv6 function after it receives an RA message with the managed address
configuration flag (M flag) set to 0 and with the other stateful configuration flag (O flag) set to 1.
Stateless address autoconfiguration means that a node automatically generates an IPv6 address based
on the information obtained through router/prefix discovery. For more information, see "Configuring
basic IPv6 settings."
As shown in Figure 370, stateles
s DHCPv6 operates as f
ollows:
1. The DHCPv6 client multicasts an Information-request message to the multicast address of all
DHCPv6 servers and DHCPv6 relay agents. The Information-request message contains an Option
Request option, specifying the configuration parameters that the client requests from the DHCPv6
server.
2. After receiving the Information-request message, the DHCPv6 server returns to the client a Reply
message containing the requested configuration parameters.
3. The client checks the Reply message. If the obtained configuration parameters match those
requested in the Information-request message, the client performs network configuration with the
parameters. If not, the client ignores the configuration parameters. If multiple replies are received,
the first received reply is used.
Figure 370 Operation of stateless DHCPv6
Protocols and standards
• RFC 3736, Stateless Dynamic Host Configuration Protocol (DHCP) Service for IPv6
• RFC 3315, Dynamic Host Configuration Protocol for IPv6 (DHCPv6)
• RFC 2462, IPv6 Stateless Address Autoconfiguration
• RFC 3633, IPv6 Prefix Options for Dynamic Host Configuration Protocol (DHCP) version 6