This article provides a solution to an issue where virtual machines lose network connectivity when you use Broadcom NetXtreme 1-gigabit network adapters.
Original product version: Windows Server 2012 R2
Original KB number: 2986895
Symptoms
When you have Hyper-V running on Microsoft Windows Server 2012 or Windows Server 2012 R2 together with Broadcom NetXtreme 1-gigabit network adapters (but not NetXtreme II network adapters), you may notice one or more of the following symptoms:
Corrupted or outdated device driver could be a reason for Broadcom 802.11n Network Adapter not working. You can fix the issue by updating your Broadcom 802.11n Network Adapter driver on Windows 10. Here is how to do it. Step 1: Right-click Start and choose Device Manager. Step 2: In the pop-up window, double-click Network adapters to extend it. Broadcom delivers 7nm 800G PAM-4 PHY for hyperscale data center and AI network Dec. 03, 2020 10:54 AM ET Broadcom Inc. (AVGO) By: Shweta Agarwal, SA News Editor. At the 'Broadcom 802.11n Network Adapter Ver. 6.30.9.44' screen, click 'Next'. At the 'License Agreement' dialog, read the agreement, then, if you agree, click 'I Agree' to continue with the installation. Net Adapter- BCM5787 NetXtreme Gigabit Ethernet Adapter - BCM5788 NetXtreme Gigabit Ethernet Adapter- BCM5789 NetXtreme Gigabit Ethernet Adapter. Your notebook has the Broadcom BCM43142 802.11b/g/n 1x1 Wi-Fi Adapter. It only works on the 2.4 GHz wireless band. Anytime you see a wifi N adapter with a suffix that ends in b/g/n, that means it is a single band (2.4 GHz only) wireless network adapter. Dual band wifi N adapters have suffixes that end in a/b/g/n, or a/g/n.
Virtual machines may randomly lose network connectivity. The network adapter seems to be working in the virtual machine. However, you cannot ping or access network resources from the virtual machine. Restarting the virtual machine does not resolve the issue.
You cannot ping or connect to a virtual machine from a remote computer. These symptoms may occur on some or all virtual machines on the server that is running Hyper-V. Restarting the server immediately resolves network connectivity to all the virtual machines.
Cause
This is a known issue with Broadcom NetXtreme 1-gigabit network adapters that use the b57nd60a.sys driver, when VMQ is enabled on the network adapter. (By default, VMQ is enabled by the Broadcom network driver.)
Broadcom designates these network adapters as 57xx based chipsets. They include 5714, 5715, 5717, 5718, 5719, 5720, 5721, 5722, 5723, and 5780.
These network adapters are also sold under different model numbers by some server OEMs. HP sells these drivers under model numbers NC1xx, NC3xx, and NC7xx. You may be using driver version 16.2, 16.4, or 16.6, depending on which OEM version you are using or whether you are using the Broadcom driver version.
Resolution
Broadcom Network & Wireless Cards Drivers
This issue is resolved in Broadcom driver b57nd60a.sys version 16.8 and newer. In March 2015, Broadcom published driver version 17.0 for download. In April 2015, HP published version 16.8 of the driver for their affected network adapters, contact your server OEM if you need a driver that is specific to your server.
Broadcom Network & Wireless Cards Drivers
If you are unable to update your network adapter driver to resolve the issue, you can work around the issue by disabling VMQ on each affected Broadcom network adapter by using the Set-NetAdapterVmq Windows PowerShell command. For example, if you have a dual-port network adapter, and if the ports are named NIC 1 and NIC 2 in Windows, you would disable VMQ on each adapter by using the following commands:
You can confirm that VMQ is disabled on the correct network adapters by using the Get-NetAdapterVmq Windows PowerShell command.
Note
By default, VMQ is disabled on the Hyper-V virtual switch for virtual machines that are using 1-gigabit network adapters. VMQ is enabled on a Hyper-V virtual switch only when the system is using 10-gigabit or faster network adapters. This means that by disabling VMQ on the Broadcom network adapter, you aren't losing network performance or any other benefits because this is the default. However, you need to do this to work around the driver issue.
Get-NetAdapterVmqQueue shows the virtual machine queues (VMQs) that are allocated on network adapters. You will not see any virtual machine queues that are allocated to 1-gigabit network adapters by default.