[Bug 230996] em/igb: Intel i210/i350: ifconfig: enabling "vlanhwtag" renders VLAN on i210/i350 NICs unusable

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=230996

Lev A. Serebryakov <lev at FreeBSD.org> changed:

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                 CC|                            |lev at FreeBSD.org

--- Comment #1 from Lev A. Serebryakov <lev at FreeBSD.org> ---
I have very similar problem: igb/I210, FreeBSD 12-ALPHA8 (r339009).
When I enable "vlanhwtag" on server, clients on this VLAN receive UDP with
broken checksums. 
For example, client can not obtain address via DHCP from server with enabled
"vlanhwtag", because DHCP client doesn't seen answers, because they are dropped
by kernel due to invalid checksum: tcpdump sees DHCPOFFER on cleint's interface
but dhclient doesn't receive anything.

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