Can't obtain ipv6 over ppp

Hi All,


I've got a curious problem. I've got ftth, with ipv6. The connection is over a vlan with pppoe. This works fine for ipv4 but I can't get ipv6 to work. It worked once, but after a reboot I can't get it to obtain it's ipv6 subnet anymore. There are RA's on the pop interface (ng0) but nothing happens, it only creates a self assigned ipv6 on the wan, but theres on ipv6 traffic to the wan and no /64. 


Situation:

- Using PPPoE over fiber. m0n0wall is directly connected to the FTU
- Internally IPv6 is working fine
- ISP delivers routed IPv6 /48 subnet and sends RA's to WAN interface
- Using setup below:

  a. At first IPv4 works, IPv6 doesn't
  b. When checked, net.inet6.ip6.accept_rtadv = 0
  c. changed to net.inet6.ip6.accept_rtadv = 1 and then m0n0wall did set IPv6
     address for the WAN interface and DNS servers
  d. after reboot, IPv6 on WAN obviously was lost
  e. setting net.inet6.ip6.accept_rtadv = 1 again didn't change anything:
    
- Now the m0n0wall logs the RA's on the WAN interface, but doesn't use them.
- Tried to setup the LAN interface with DHCP-PD, since I read that my ISP (xs4all.nl) uses PD. But that didn't change anything
- Tried setting 'Sent route advertisements' to enabled on WAN, no difference.
- I get the following log entries: 

    Feb  6 23:04:52 m0n0wall ipmon[161]: 23:04:51.805353 2x ng0 @0:15 b fe80::204:76ff:fe21:8100 -> ff02::2 PR icmpv6 len 48 72 icmpv6 groupmemberterm/0 OUT multicast
    Feb  6 23:04:55 m0n0wall ipmon[161]: 23:04:54.816124 ng0 @0:15 b fe80::204:76ff:fe21:8100 -> ff02::2:8ff3:3806 PR icmpv6 len 48 72 icmpv6 groupmemberreport/0 OUT multicast
    Feb  6 23:04:58 m0n0wall ipmon[161]: 23:04:57.815652 ng0 @0:15 b fe80::204:76ff:fe21:8100 -> ff02::1:ff21:8122 PR icmpv6 len 48 72 icmpv6 groupmemberreport/0 OUT multicast
    Feb  6 23:05:01 m0n0wall rtadvd[940]: <ra_input> received RA from fe80::90:1a00:1a4:1f2 on non-advertising interface(ng0)


Relevant m0n0wall settings:

- IPv6 is enabled
- WAN:

  - Type: PPPoE
  - IPv6 mode: PPP

- LAN & OPT1:

  - IPv6 mode: static
  - IPv6 address: /64
    -> suggested IPv6 address: 'Router advertisements are not enabled on WAN interface.'
  - IPv6 RA: all options set
  - clients on LAN and OPT1 work fine when using ipv6 to *internal* addresses


I'm lost, any suggestions?


Peter