[Bug 227033] vxlan(4) does not work with vni larger than 65535

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=227033

            Bug ID: 227033
           Summary: vxlan(4) does not work with vni larger than 65535
           Product: Base System
           Version: 11.1-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: susurrus.silent at gmail.com

vxlan(4) does not work with vni >= 65536.

How to reproduce:

on host A:
ifconfig vxlan create inet 192.168.200.1/24 vxlanvni 65536 vxlanlocal
192.168.100.1 vxlanremote 192.168.100.2

on host B:
ifconfig vxlan create inet 192.168.200.2/24 vxlanvni 65536 vxlanlocal
192.168.100.2 vxlanremote 192.168.100.1

on host A:
ping -n 192.168.200.2

host B is unreachable as host B does not respond to arp request.

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