BG96 IPv6-only Problems

  • UE is trying to register with IPv6 (PDN configured as only IPv6).
  • Initial attach succeeds.
  • Router Solicitation Message is replied with Router Advertisement (carrying the IPv6 prefix).
  • UE does ask multiple times again (Router Solicitation over NAS), gets same Reply.
  • UE detaches.

Can anyone please explain me what is missing? I attached screenshots from the captures. The MAC headers in the NAS message should be fine (work everywhere else).

I tried with different source addresses in IPV6, too. Can anyone provide an example, what is necessary here?