[Bug 231050] NFS via IPv6 between 11.2-REL amd64 fails for larger directories

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=231050

            Bug ID: 231050
           Summary: NFS via IPv6 between 11.2-REL amd64 fails for larger
                    directories
           Product: Base System
           Version: 11.2-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: pi at FreeBSD.org

NFS via IPv6 between 11.2-REL amd64
boxes failed for directories with more than 45 files or directories.
Small directories worked. It seems to be an issue with
ipv6 fragmentation (?), as can be seen by tcpdump:

17:54:16.855978 IP6 nfs-serv > nfs-client frag (0|1448) 2049 > 709: NFS
reply xid 1536109002 reply ok 1440 readdir
17:54:16.855979 IP6 nfs-serv > nfs-client frag (1448|36)

As soon as the NFS request is sent with fragments, it stalls.

Using TCP or IPv4 for the nfs mount works, UDP fails.

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