The auto-configuration available with IPv6 networks makes it very easy and convenient to configure the clients.
However, in order for a client to receive additional information, such as a DNS server address, you must configure the device so that it can activate the DHCPv6 client when necessary.
The settings for the DHCPv6 client ensure that a device receiving certain flags in the router advertisement will start the DHCPv6 client, which can then send requests to the DHCPv6 server:
- M flag: If an appropriately configured device receives a router advertisement with the 'M flag' set, the DHCPv6 client will request an IPv6 address from the DHCPv6 server along with other information such as DNS server, SIP server and NTP server.
- O flag: With an 'O flag', the DHCPv6 client requests the DHCPv6 server for information such as a DNS server, SIP server and NTP server only, but not an IPv6 address.Anmerkung: If the 'M-flag' is set, the 'O-flag' does not necessarily have to be set as well.
Anmerkung: With IPv6, the default route is distributed via router advertisements and not via DHCPv6.