[rbak-nsp] Dual-Stack configuration for PPPoE subscribers

[Alex D.]

Hi,

currently we have ~8000 PPPoE users terminated on a SE600 running 
SEOS-11.1.2.4p3. All users get IPv4 addresses either from a dynamic pool 
or as a framed-ip assigned via RADIUS. In the near future, i also want 
to assign IPv6 addresses to the customers. The SE600 itself is already 
configured for IPv6, but i didn't activate it in the logical 
"subscriber"-interface.
Can someone give me a hint, which stebs are necessary for extending my 
setup?
Questions:
- Is it enough to configure a ipv6 pool on the "SUBSCRIBER" interface 
and refer to it in the "subscriber default" ?
- Where can i configure my delegated-prefix pool ?
- Is it possible to activate or deactivate IPv6 for certain customers, 
e.g. based on a specific RADIUS attribute (compared to Ciscos AVpair 
"lcp:interface-config#1=ipv6 enable") ?

Here's the relevant IPv4 part of my configuration:

context local
~
  interface LOOPBACK-0 loopback
   ip address <ip>/32
   ipv6 address <ipv6>/128
    ip source-address snmp radius tacacs+ syslog
!
  interface SUBSCRIBER multibind lastresort
   ip unnumbered LOOPBACK-0
   ip clear-df
   ip pool <network>/18
!
  subscriber default
    ip address pool name SUBSCRIBER
    port-limit 6
    ppp mtu 1492
    dns primary <ip>
    dns secondary <ip>
!

Thanks in advance...
Regards,
Alex