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Subject: [Bug 221754] arp: packet with invalid ethernet address length 0
 received
Date: Thu, 24 Aug 2017 06:36:35 +0000
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X-Bugzilla-Type: new
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X-Bugzilla-Product: Base System
X-Bugzilla-Component: kern
X-Bugzilla-Version: 11.1-RELEASE
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X-Bugzilla-Severity: Affects Only Me
X-Bugzilla-Who: pzhel@iihr.ru
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D221754

            Bug ID: 221754
           Summary: arp: packet with invalid ethernet address length 0
                    received
           Product: Base System
           Version: 11.1-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs@FreeBSD.org
          Reporter: pzhel@iihr.ru

We have two Virtual FreeBSD machines on Hyper-V 2008R2 server.=20
VM#1 - FreeBSD 10.3-RELEASE-p18 amd64
VM#2 - FreeBSD 11.1-RELEASE amd64

Both VM's connected to the same LAN 192.168.0.0/17

On VM#2 /var/log/messages permanently registering an error

arp: packet with invalid ethernet address length 0 received on hn0

tcpdump on hn0 show this

17:48:17.035879 ARP, Ethernet (len 0), Unknown Protocol (0xf000) (len 1),
length 50

Quick Google search show that such packets can be generated by D-Link DES/D=
GS
Metro series switches. We have a number of D-Link switches in our LAN, but =
we
never see this error on FreeBSD 8.x/9.x/10.x before

Can it be fixed?
Or,how we can supress this error messages on 11.1, because replacing D-Link
switches is not a solution.

--=20
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