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Date:      Fri, 14 Sep 2018 20:32:44 -0500
From:      Eric van Gyzen <eric@vangyzen.net>
To:        freebsd-current@freebsd.org, freebsd-net@freebsd.org
Subject:   Bad DHCP Checksums over VLANs
Message-ID:  <9dd3c7f9-d970-5d30-ebf2-c0f40c76011b@vangyzen.net>

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Folks,

I'm running head (ALPHA4-ish) on a DHCP server and a client.  DHCP works 
fine on the physical interfaces, but when I run it on a VLAN, I get

	5 bad udp checksums in 5 packets

from dhclient.  Full details here:

	https://people.freebsd.org/~vangyzen/dhcp_vlan/

This happens for /all/ clients.

This is a new setup, so I don't know when it got broken, and I can't bisect.

The server NIC is common (I211), so maybe it's easy to reproduce.  I'll 
help as much as I can, of course.

Eric



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