MS DNS doesn't answer to CURRENT under Hyper-V

[Glen Barber]

BTW, are you using the images from VMDepot?  If so, this was MFC'd after
the recent images.  I can easily regenerate an updated image, if you are
using those.

Glen

On Tue, Jul 07, 2015 at 04:55:39PM +0300, Pavel Timofeev wrote:
> Wow, r284746 was MFCed to 10 STABLE!
> I should hurry up!
> 
> 2015-07-07 16:26 GMT+03:00 Pavel Timofeev <timp87 at gmail.com>:
> > Ok, I'll try r284745 and then r284746 and see what happens.
> >
> > 2015-07-07 16:06 GMT+03:00 Wei Hu <weh at microsoft.com>:
> >>> -----Original Message-----
> >>> From: owner-freebsd-virtualization at freebsd.org [mailto:owner-freebsd-
> >>> virtualization at freebsd.org] On Behalf Of Pavel Timofeev
> >>> Sent: Tuesday, July 7, 2015 7:51 PM
> >>> To: freebsd-current at freebsd.org; freebsd-virtualization at freebsd.org
> >>> Subject: MS DNS doesn't answer to CURRENT under Hyper-V
> >>>
> >>> Hi!
> >>> I have a test virtual machine which runs CURRENT under Hyper-V. It's
> >>> amd64 r285198 now.
> >>> It can't get any response from MS DNS server. Well, it could two or three
> >>> weeks ago, but after upgrade it's not able to do it anymore.
> >>> Google DNS answers without problems meanwhile (sic!).
> >>>
> >>> What I do:
> >>> # host google.ru 192.168.25.3
> >>> I see that MS DNS (192.168.25.3) server receives these packets, but ignores
> >>> them.
> >>> And no matter how my system asks MS DNS. Every daemon can't get
> >>> response too.
> >>>
> >>> I know that nothing was changed in MS DNS server. No doubt.
> >>> Then I tried different available CURRENT snapshot ISOs.
> >>>
> >>> FreeBSD-11.0-CURRENT-amd64-20150630-r284969-disc1.iso - MS DNS does
> >>> not answer.
> >>>
> >>> FreeBSD-11.0-CURRENT-amd64-20150625-r284814-disc1.iso - MS DNS does
> >>> not answer.
> >>>
> >>> FreeBSD-11.0-CURRENT-amd64-20150618-r284544-disc1.iso - MS DNS
> >>> answers!
> >>>
> >>> So something was committed to CURRENT between 20150618 and 20150625.
> >>> This something ruins communication with MS DNS.
> >>>
> >> There was a commit for Hyper-V TSO and checksum offloading support  (r284746) on
> >> June 24th. I think this commit is the cause. Can you verify the MS DNS behavior between
> >> The builds of June 23rd and 24th? I will take a look of this issue tomorrow.
> >>
> >> Thanks,
> >> Wei
> >>
> >>
> >>
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