As you will see here, two kinds of IPv6 address autoconfiguration exist. One of them is the old and well-known way to automatically configure IP addresses from the IPv4 world, DHCP. The other way is to make the autoconfiguration in the IPv6 world in a new and interesting way. It allows the hosts to make the autoconfiguration by themselves without the need to communicate with anybody else on the network.
IPv6 is meant for various purposes, but one main purpose it serves is that it makes the life of network administrators easier, especially when it comes to dealing with the vast address space provided by IPv6. The IPv6 address number is fairly bigger than the IPv4. In order to make things work out of the box, an automatic address configuration was created.
Flag M = Managed address configuration = if is 0, you are on your own
Flag o = other configuration = I'm on my own, but i will ask the DHCP server for other options like DNS
Note, if client rx IPv6 with our DNS performs conf bellow on gateway
Juniper
show configure protocols router-advertisement interface irb.000 | display set
set protocols router-advertisement interface irb.000 managed- configuration
set protocols router-advertisement interface irb.000 other-stateful-configuration.
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Cisco
Router (config-if)#ipv6
managed-config-flag
other-config-flag
Packet capture, look for the two-term below. If 0 means did not enable on our router, and we need to check on the router configure
Managed address configuration
other configuration
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