Date: Wed, 22 Jul 2015 16:04:24 +0300 From: Pavel Timofeev <timp87@gmail.com> To: Wei Hu <weh@microsoft.com> Cc: Slawa Olhovchenkov <slw@zxy.spb.ru>, "freebsd-current@freebsd.org" <freebsd-current@freebsd.org>, "freebsd-virtualization@freebsd.org" <freebsd-virtualization@freebsd.org> Subject: Re: MS DNS doesn't answer to CURRENT under Hyper-V Message-ID: <CAAoTqftfJbcaHFUeAEYnFpNqhVvyqE=BUwJbE6BSEJ_PEQ9Dwg@mail.gmail.com> In-Reply-To: <BY1PR03MB1434AB3E1C8F2D66BDE1AB2CBB9C0@BY1PR03MB1434.namprd03.prod.outlook.com> References: <CAAoTqftvtQunx%2BWCL4%2BBz-mYSgqCTcGx1aAyemfaz%2B=0ogZuWw@mail.gmail.com> <20150707130902.GA41189@zxy.spb.ru> <CAAoTqfsUfdAP1G=U4eDg3hfmuHtoosgGjOd9gMrehX%2BrcxaiJw@mail.gmail.com> <20150707154906.GA44094@zxy.spb.ru> <CAAoTqft_u1YEOGf6pThhHd-JuYoGnxzQxFpo-57SCUJ0OksWGw@mail.gmail.com> <BY1PR03MB1434AB3E1C8F2D66BDE1AB2CBB9C0@BY1PR03MB1434.namprd03.prod.outlook.com>
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Hi! I see you have done the code for disabling UDP checksum offloading when running on the Hyper-V on Windows Server 2012 and earlier hosts https://svnweb.freebsd.org/base?view=3Drevision&revision=3D285785 I tried new CURRENT and it works. Thank you! A small note here: while it disables and works it still shows RXCSUM and TSCSUM in iface's options: root@proxy:/usr/src # ifconfig hn0 hn0: flags=3D8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500 options=3D31b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,TSO4,TSO6> ether 00:15:5d:02:9c:09 inet 192.168.25.26 netmask 0xffffffc0 broadcast 192.168.25.63 nd6 options=3D29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL> Is it possible to hide it automatically if it's disabled by new code? 2015-07-13 11:06 GMT+03:00 Wei Hu <weh@microsoft.com>: > We have root caused the problem. This issue happens on the Hyper-Vs on Wi= ndows Server 2012 (Win 8.0) and earlier releases. On these releases, the UP= D checksum offloading on host side does not work properly. The workaround i= s to disable UPD checksum offloading in the FreeBSD guest through 'ifconfig= '. We are also working on a patch to turn off UPD checksum offloading in th= e netvsc driver when detecting the Hyper-V releases. > > The UDP checksum offloading works fine on Windows Server 2012R2 and Win 8= .1 hosts. > > Thanks Pavel and Slawa for the support. > > Wei > > >> -----Original Message----- >> From: owner-freebsd-virtualization@freebsd.org [mailto:owner-freebsd- >> virtualization@freebsd.org] On Behalf Of Pavel Timofeev >> Sent: Wednesday, July 8, 2015 4:06 PM >> To: Slawa Olhovchenkov >> Cc: freebsd-current@freebsd.org; freebsd-virtualization@freebsd.org >> Subject: Re: MS DNS doesn't answer to CURRENT under Hyper-V >> >> 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). >> _______________________________________________ >> freebsd-virtualization@freebsd.org mailing list >> http://lists.freebsd.org/mailman/listinfo/freebsd-virtualization >> To unsubscribe, send any mail to "freebsd-virtualization- >> unsubscribe@freebsd.org"
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