I've been searching everywhere i could but i didn't find a large scale solution for IPv6 only network with RouterOS.
In fact, according to the informations i got, with IPv6, you can't have Framed-IP-Address because IPv6 Address don't rely on PPP but on IPv6 itself:
1) You have to use Framed-IPv6-Prefix but the client side has no idea of its attributed prefix
2) You can set attributed Prefix statically on client LAN interface(s) on initial provisioning but your router won't be accessible through a "WAN" IP, because the PPPoE attributed IPv6 address is local (fe80)
3) You can use DHCPv6-PD but it is totally static (and buggy), each pppoe server should use a static pool and prefixes are then affected to clients dynamically, but because DHCPv6 doesn't rely on radius, you have no idea on which prefix from the pool is affected to which router.
So, if you want to manage your router, you should use a static IPv6 address you have set manually on the LAN side (at provisioning time), but if you then want to change it... problems begins because you don't have other ip to manage your router.
You then have to use radius to know the NAS address, then script to search DHCPv6 bindings that matches your router (if you find it through the UID that might be different than the ethernet mac used for pppoe login).
I think, if all these facts are true, that's not a large scale optimized situation. Worse, if you suceed in implementing these tweaks, your lucky if they work....
If i'm wrong somewhere or if somebody have ideas on how to achieve large scale IPv6 only networks, please let me know...
If Mikrotik have prevision on a date to get, at least, RADIUS accounting for DHCPv6-PD with information on pppoe interface / username source of the DHCPv6 client request, so it would be easier to know which router got which IP address, that would be great.
Maybe the actual thinking is to use IPv6 only for Clients LAN side, and keep IPv4 for router managing purposes, but that's a bit risky for the future evolutions.
Thank you for your comments and your help