Setting Autonomous flag per prefix

RouterOS General
1

I’m trying to get selected VLANs to have Autonomous=No - their IP addresses will be managed/issues by DHCPv6 and no SLAAC

As soon as I set an Address to Advertise=yes it creates a dynamic entry in the prefixes list. This happens even if I have a manual Prefix created and enabled beforehand with the same prefix/interface details. The existing manual entry then becomes unmanageable in the UI

On another thread I saw a command to change the ND defaults to be able to set Autonomous=No as a default, but then I cant set =Yes for client VLANs because of the above problem. (

/ipv6/nd/prefix/default > set autonomous=no

I couldnt find an equivalent in the UI

Is there a way to disable dynamic prefix creation?

2

Sure, don’t use advertise=yes, that’s what creates dynamic prefix in /ipv6/nd. Use advertise=no and add prefix in /ipv6/nd manually with whatever parameters you need.

And /ipv6/nd/prefix/default in GUI is IPv6->ND->Prefixes->Default button.

3

But if I don’t advertise the address then the router interface address wont be included in the RA so client wont get a default gateway?

Found the “default” in the UI, thanks!

4

Test it yourself, client uses link-local address (fe80::something) as gateway anyway.