The following scenario I observed now several times:
1. Reboot the router
2. The router gets no mobile IPv6-address (but modem is running)
3. I reboot the modem
4. The router gets an IPv6-address
5. 15 seconds later the router does a system-reboot (dont know why)
6. After the system-reboot the router has no IPv6-address and we are at step one again...
I have no idea what is goning on. 1 out of 10 times the router gets an IPv6 address and everything is working fine. But it is really volatile.
I´m working with a RUTX09 and firmware RUTX_R_00.07.00