Ok, I'll try r284745 and then r284746 and see what happens.

2015-07-07 16:06 GMT+03:00 Wei Hu <w...@microsoft.com>:
>> -----Original Message-----
>> From: owner-freebsd-virtualizat...@freebsd.org [mailto:owner-freebsd-
>> virtualizat...@freebsd.org] On Behalf Of Pavel Timofeev
>> Sent: Tuesday, July 7, 2015 7:51 PM
>> To: freebsd-curr...@freebsd.org; freebsd-virtualization@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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