From owner-freebsd-virtualization@freebsd.org  Wed Jul  8 08:05:41 2015
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Date: Wed, 8 Jul 2015 11:05:39 +0300
Message-ID: <CAAoTqft_u1YEOGf6pThhHd-JuYoGnxzQxFpo-57SCUJ0OksWGw@mail.gmail.com>
Subject: Re: MS DNS doesn't answer to CURRENT under Hyper-V
From: Pavel Timofeev <timp87@gmail.com>
To: Slawa Olhovchenkov <slw@zxy.spb.ru>
Cc: freebsd-current@freebsd.org, 
 "freebsd-virtualization@freebsd.org" <freebsd-virtualization@freebsd.org>
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Ok, r284746 is the root of the problem. MS DNS works under r284745 and
doesn't work under r284746.
Slawa, what should I look at in wireshark output?


2015-07-07 18:49 GMT+03:00 Slawa Olhovchenkov <slw@zxy.spb.ru>:
> On Tue, Jul 07, 2015 at 06:04:46PM +0300, Pavel Timofeev wrote:
>
>> Well, turning off checksum offloading by `ifconfig hn0 -txcsum
>> -rxcsum` definitely helps.
>>
>> As for tcpdump I'm not completely sure if I did it right, but I see
>> "bad udp cksum" phrase:
>>
>> # tcpdump -i hn0 -vvv -nn udp dst port 53
>> tcpdump: listening on hn0, link-type EN10MB (Ethernet), capture size
>> 262144 bytes
>> 18:01:19.139994 IP (tos 0x0, ttl 64, id 61218, offset 0, flags [none],
>> proto UDP (17), length 51)
>>     192.168.25.26.45683 > 192.168.25.3.53: [bad udp cksum 0xb39e ->
>> 0xf210!] 52886+ A? ya.ru. (23)
>> 18:01:24.140544 IP (tos 0x0, ttl 64, id 17293, offset 0, flags [none],
>> proto UDP (17), length 51)
>>     192.168.25.26.12575 > 192.168.25.3.53: [bad udp cksum 0xb39e ->
>> 0x7365!] 52886+ A? ya.ru. (23)
>
> tcpdump "bad udp cksum" is normal on FreeBSD host in case checksum
> offload (and may be need only for help finding issuse in code). Need
> wireshark capturing from MS DNS host (or from mirroring port).