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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