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Stateless DHCPv6
Stateless DHCPv6 enables a device that has obtained an IPv6 address/prefix to get other
configuration parameters from a DHCPv6 server.
The device performs stateless DHCPv6 if an RA message with the following flags is received from
the router during stateless address autoconfiguration:
• The managed address configuration flag (M flag) is set to 0.
• The other stateful configuration flag (O flag) is set to 1.
For more information about stateless address autoconfiguration, see "Configuring basic IPv6
settings."
Figure 100 Stateless DHCPv6 operation
As shown in Figure 100, stateless DHCPv6 operates in the following steps:
1. The DHCPv6 client sends 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 that specifies the requested configuration parameters.
2. 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 uses these parameters to complete
configuration. If not, the client ignores the configuration parameters. If the client receives
multiple replies with configuration parameters matching those requested in the
Information-request message, it uses the first received reply.
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
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