dhcpv6-pd assign subnet to interface

RouterOS General
1

Hi
Just been set up with ISP provided v6 and I’m figuring out dealing with dhcpv6-pd assigned space.

My question:

If I’ve been assigned 2001:dead:beef:cafe:ff00::/56 and I would like my 1st bridge interface to always get the 1st address on the 1st prefix /64 - i.e.: 2001:dead:beef:cafe:ff01::1/64

Do I do something like
add address=::1:0:0:0:1 from-pool=o2-dynpool interface=MyLan

It doesn’t seem to work - is there something I’m missing?

According to docs from AN other router manufacturer this is technically possible- eg
interface FastEthernet 0/1/0
description local network 1
ipv6 address prefix-from-provider ::01:0:0:0:100/64

Thanks in advance
Ben

2

No, having a subnet hint does not work. There are a number of grumbles about this in other forum posts.

3

RouterOS only allows to customize Interface ID, but it will pick Subnet ID for you.

Please create a feature request at https://help.mikrotik.com/servicedesk/servicedesk

4

OK, thanks for clarifying.. looks like Vyos can’t either.

Created support request

5

My experience is that the addresses are requested/assigned in the order you created them, and this is the same every time.
In my case that results in the first interface getting :1: at my ISP, but when I use the same config behind an AVM router it gets :fc:.
So no, no direct influence on what subnet number you get, but no real issue either as it does not appear to become “dynamic”.

6

Correction - Vyos can