Hi Jac,
Kylie meant disabling TSO. Please try this ("ifconfig hn0 -tso").

The message " hn0: unknown status 1073872902 received" should be an unnecessary 
warning only.
My 10.2 VM can work fine even if I see the message too.

Can you please install a 10.2 VM from the 10.2 .ISO file directly as I did and 
see if it works for you?

I guess we never tried upgrading 10.1 from 10.2.
Can you please list the steps how you did the upgrading? We'll try the same 
steps.

Thanks,
-- Dexuan

> -----Original Message-----
> From: Kylie Liang
> Sent: Tuesday, January 26, 2016 8:01
> To: Jac Backus <j.bac...@bugworks.com>; 'freebsd-virtualization@freebsd.org'
> <freebsd-virtualization@freebsd.org>; BSD Integration Components for Hyper-V
> <bs...@microsoft.com>
> Subject: RE: Hyper-V networking: problem after upgrade to 10.2
> 
> Hi Jac,
> 
> Thank you for asking. To isolate your issue, could you please try disabling 
> SO on
> your 10.2 system first? Thank you.
> 
> And I would like to confirm with you
> 1) You met issue for 10.2 kernel + 10.2 system
> 2) No issue for 10.1 kernel + 10.1 system
> 3) No issue for 10.1 kernel + 10.2 system
> 
> Right? And add our engineers in the list.
> 
> Thanks,
> Kylie Liang
> 
> -----Original Message-----
> From: owner-freebsd-virtualizat...@freebsd.org [mailto:owner-freebsd-
> virtualizat...@freebsd.org] On Behalf Of Jac Backus
> Sent: Tuesday, January 26, 2016 5:56 AM
> To: 'freebsd-virtualization@freebsd.org' <freebsd-virtualization@freebsd.org>
> Subject: Hyper-V networking: problem after upgrade to 10.2
> 
> Dear reader,
> 
> Today, I did  upgrade  FreeBSD 10.1 to 10.2 running on Hyper-V on a full 
> patched
> Windows Server 2012 R2 x64 version.
> 
> After the update, networking does not work anymore.
> 
> In /var/log/messages is this:
> 
> Jan 25 21:02:01 mercurius kernel: hn0: <Synthetic Network Interface> on
> vmbus0 Jan 25 21:02:01 mercurius kernel: hn0: unknown status 1073872902
> received Jan 25 21:02:01 mercurius kernel: hn0: unknown status 1073872902
> received Jan 25 21:02:01 mercurius kernel: hn0: hv send offload request
> succeeded Jan 25 21:02:01 mercurius kernel: hn0: Using defaults for TSO:
> 65518/35/2048 Jan 25 21:02:01 mercurius kernel: hn0: Ethernet address:
> 00:15:5d:ac:11:08 Jan 25 21:02:01 mercurius kernel: hn1: <Synthetic Network
> Interface> on vmbus0 Jan 25 21:02:01 mercurius kernel: hn1: unknown status
> 1073872902 received Jan 25 21:02:01 mercurius kernel: hn1: unknown status
> 1073872902 received Jan 25 21:02:01 mercurius kernel: hn1: hv send offload
> request succeeded Jan 25 21:02:01 mercurius kernel: hn1: Using defaults for 
> TSO:
> 65518/35/2048 Jan 25 21:02:01 mercurius kernel: hn1: Ethernet address:
> 00:15:5d:ac:11:09 Jan 25 21:02:01 mercurius kernel: hn2: <Synthetic Network
> Interface> on vmbus0 Jan 25 21:02:01 mercurius kernel: hn2: unknown status
> 1073872902 received Jan 25 21:02:01 mercurius kernel: hn2: unknown status
> 1073872902 received Jan 25 21:02:01 mercurius kernel: hn2: hv send offload
> request succeeded Jan 25 21:02:01 mercurius kernel: hn2: Using defaults for 
> TSO:
> 65518/35/2048 Jan 25 21:02:01 mercurius kernel: hn2: Ethernet address:
> 00:15:5d:ac:11:07
> 
> It worked fine with the 10.1 kernel, and when I boot this kernel, it works 
> again:
> 
> Jan 25 22:20:02 mercurius kernel: hn0: <Synthetic Network Interface> on
> vmbus0 Jan 25 22:20:02 mercurius kernel: hn0: Ethernet address:
> 00:15:5d:ac:11:07 Jan 25 22:20:02 mercurius kernel: hn1: <Synthetic Network
> Interface> on vmbus0 Jan 25 22:20:02 mercurius kernel: hn1: Ethernet address:
> 00:15:5d:ac:11:08 Jan 25 22:20:02 mercurius kernel: hn2: <Synthetic Network
> Interface> on vmbus0 Jan 25 22:20:02 mercurius kernel: hn2: Ethernet address:
> 00:15:5d:ac:11:09
> 
> So I am running  a 10.2 system on a 10.1 kernel at the moment.
> 
> I found nothing in /usr/src/UPDATING and not really anything on the net.
> 
> So, could you tell why does this happen, and how can I solve this?
> 
> Thanks for the help!
> 
> With kind regards,
> 
> Jac Backus
> 
> 
> 
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