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 OTHER HALP! Linux, Hardware, and Anything Else
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 Hyper-V Guest - NIC Not passing traffic
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danf
Here To Stay

USA
161 Posts
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Posted - 10/13/2011 :  08:36:26 AM  Show Profile  Reply with Quote
Hi,

For a 2k8R2 Hyper-V Host with a 2k8r2 Web Edition Guest. One of the two "External" virtual Network or Guest NIC is not passing traffic. This was previously working and now is not, I'm not sure what may have caused this to stop. There have been a few changes to the Host (FW, Windows Updates). There are two Virtual NICS on the guest, one of them is working w/o issue.

2k8R2 Hyper-V Host Specs.
HP ML370 G6 with NC365T 4-Port NIC (Intel Chipset) with the most current drivers and HP NIC Configuration Utility.

The NIC on the Hyper-V host, when not configured as a virtual network but configured with an IP on the host or as a virtual network with "Allow management..." checked, is able to pass traffic as expected; meaning I'm ruling out a bad switch configuration etc.

I've disabled TCP Checksum and Large Sender Offload on both the Host and Guest. I see under the Status (Bytes Sent/Received) on the Host interface - there is "Received' traffic but non "Sent". On the Hyper-V Guest there is "Sent" but non "Received".

What are my next steps to get this NIC to pass traffic?


Thanks,
Dan Foxley

Dan Foxley

Curt
Moderator

USA
6807 Posts
Status: offline

Posted - 10/13/2011 :  09:58:53 AM  Show Profile  Visit Curt's Homepage  Reply with Quote
Does Intel have updated drivers for the NICs that will support IPV6?

Curt Spanburgh
Microsoft Certified Business Solution Specialist.
Dynamics CRM MVP
Contributing Editor, Windows IT Pro

He that is walking with wise persons will become wise, but he that is having dealings with the stupid ones will fare badly.
Proverbs 13:20


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danf
Here To Stay

USA
161 Posts
Status: offline

Posted - 10/13/2011 :  10:53:15 AM  Show Profile  Reply with Quote
Curt,

As these are branded HP NICs with and Intel chipset, I'm not sure how to get the matching driver, or if I even should.

Are you suggesting Intel IPv6 drivers will help with this issue?

Dan

Dan Foxley
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Curt
Moderator

USA
6807 Posts
Status: offline

Posted - 10/13/2011 :  11:50:46 AM  Show Profile  Visit Curt's Homepage  Reply with Quote
Well, perhaps the NIC Vendor drivers.
I take it IPV6 is enabled on the servers.
On an international ISPs network we encountered this issue.
It turned out that updated drivers on the HBAs fixed the problem.

During one meeting I was floored by the comment of one "network engineer". "I don't see a problem since I can ping the server".

Truly not thinking about how applications communicate.

We shut off IPV6 and things started working.
Well, that's not such a great Idea for folks who are looking for better performance.
With the updated drivers we went back and all is well with Exchange and SQL Server access.

Your milage may vary.

But it's worth looking into.

Curt Spanburgh
Microsoft Certified Business Solution Specialist.
Dynamics CRM MVP
Contributing Editor, Windows IT Pro

He that is walking with wise persons will become wise, but he that is having dealings with the stupid ones will fare badly.
Proverbs 13:20


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danf
Here To Stay

USA
161 Posts
Status: offline

Posted - 10/24/2011 :  11:26:32 AM  Show Profile  Reply with Quote
I resolved the issue, I ran the following on the Hyper-V guest.

http://support.microsoft.com/kb/299357
netsh int ip reset


I recall using this in the past...thankfully it resolved the issue. It wiped all the TCP/IP info on the nics, required reboot, but after re-entering the IP info, traffic is now passing correctly.

Dan Foxley

Dan Foxley

Edited by - danf on 10/24/2011 11:27:08 AM
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Curt
Moderator

USA
6807 Posts
Status: offline

Posted - 10/24/2011 :  11:49:44 AM  Show Profile  Visit Curt's Homepage  Reply with Quote
Ok, so it was at the NIC level again on the VMs.

But I would love to know the details on that.
Does not sound like a production solution.

Curt Spanburgh
Microsoft Certified Business Solution Specialist.
Dynamics CRM MVP
Contributing Editor, Windows IT Pro

He that is walking with wise persons will become wise, but he that is having dealings with the stupid ones will fare badly.
Proverbs 13:20


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