All dynamic addressing start with RA messages ( they are sent every 200ms )
An RA ICMPv6 is sent to all IPv6 Devices ( FF02::1 )
Or when an RS iICMPv6 To all routers ( FF02::2 ) received from the HOST
To be able to send an receive RA and SA the command: ipv6 unicast-routing need to be configured.
There are 3 options for the router to choose how to respond to the advertisement :
1- SLAAC – No DHCPv6 ( that means that the router will provide all configuration configure on the router )
2- SLAAC – SLAAC + Stateless DHCPv6 for DNS address ( that mean that the router will provide some information but need a DHCPv6 server to provide the missing informations ex: DNS informations)
3- SLAAC – Stateful all addressing except the default gateway ( link-local address ) use DHCPv6.Server
More to come here regardings the FLAGS and configurations that go with it.
In order for the client to know that that we are using a stateful or stateless configuration all this is done on the interface configuration :
ipv6 nd managed-config-flag = Stateful configuration.
( u will need to configure the dhcp relay destination under the interface “ipv6 dhcp relay destination “ipv6add” “outgoing interface” unless it is link-local)
ipv6 nd other-config-flag = Stateless configuration.
ISP example :
These slides where use of LiveLessons IPV6 Fundamentals
