[Bug 231144] fragmented IPv6 drops

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=231144

            Bug ID: 231144
           Summary: fragmented IPv6 drops
           Product: Base System
           Version: 11.2-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: admin at canmos.net

Hello!

I have a problem with handling fragmented IPv6 packets.

Exactly:
- My system is FreeBSD 11.2-RELEASE-p2 with GENERIC kernel
- I have configured IPv6-only authoritative DNS server
And when the oid net.inet6.ip6.forwarding is set to 1, the system stops to
receive fragmented IPv6 packets. If i set net.inet6.ip6.forwarding to 0, the
behavior is returning to normal. As i know IPv6 packets MUST NO be fragmented
by transit gateways itself. But there is no anything said about incoming
packets that are ALREADY fragmented. So could you please help me to solve this
issue?
For comparesion i tried to reproduce the problem under FreeBSD-10.3. There is
no any issues with fragmented IPv6, all the packets were handled by system as
well, regardless of meaning net.inet6.ip6.forwarding sysctl.

Thank you in advance!

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