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USB Network Native Driver Fling for ESXi 8.0 Update 1

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Songtao and I are happy to share that we now have a compatible version of the USB Network Native Driver for ESX v1.12 Fling that supports the latest ESXi 8.0 Update 1 release! ?

This release also includes a couple of minor enhancement and fixes which are listed below:

  • Support for new DLINK RTL8156 device (0x2001:0xb301)
  • Updated maximum supported USB Network devices from 8 to 12
  • Resolved 2.5GbE link speed issue for RTL8156 adapter

Additionally, while ESXi 8.0 Update 1 has just been released, we know that not everyone will be on the latest version and these enhancement and fixes have also been ported to a version of USB Network Native Driver for ESX v1.12 Fling driver to also support ESXi 8.0, 8.0a, 8.0b, etc.

Use the following ESXi Component ZIP files based on your desired version of ESXi 8.x:

  • ESXi 8.0 - ESXi800-VMKUSB-NIC-FLING-64098182-component-21668107.zip
  • ESXi 8.0 Update 1 - ESXi80U1-VMKUSB-NIC-FLING-64098092-component-21669994.zip

Note: There are no plans to backport these enhancements/fixes to prior ESXi releases

Finally, if you are looking to create a custom ESXi ISO or Image Profile AND you either have an existing or can deploy a vCenter Server, please refer to this blog post for using vSphere Lifecycle Manager (vLCM) via the UI or PowerCLI to create your custom images.


If you do NOT have or can not deploy a vCenter Server (no hosts required), then you can refer to this blog post for using PowerCLI Image Builder to create your custom images, but make sure you update Python dependency to at least 3.7.9+ or you will run into this issue.

How to enable passthrough for USB Network Adapters claimed by ESXi CDCE Driver?

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As part of vSphere 7.0, ESXi now ships with a USB CDCE (Communication Device Class Ethernet) driver which can benefit customers with SB network adapters that support the CDCE specification as shared in this blog post HERE. This can especially be useful for those running a VMware Homelab where the onboard network adapter may not be supported and using a CDCE USB network adapter would allow you to install ESXi.

When a CDCE-supported USB network adapter is connected to an ESXi host, it will automatically be claimed by the CDCE driver as shown in the screenshot below.


If you are planning to use the USB network adapter for VMkernel traffic, then there is no workflow change like any other physical network adapter. However, if you intend to passthrough the USB network adapter to a VM, then you may find that it is not working as expected.


The reason for this is that ESXi has already claimed the USB device, assuming you wish to use it for VMkernel traffic. To change the behavior for a particular CDCE-supported USB network adapter, we just need to apply a USB Quirk which tells ESXi to ignore this adapter.

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Quick Tip - Enabling ESXi Coredumps to be stored on USB

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I was recently working with Engineering to reproduce an issue which causes an ESXi PSOD (Purple Screen of Death) and I wanted the generated ESXi coredump to simply write to the USB device, which I could easily grab.

As of ESXi 7.x, I know we had removed a few of the old ESXi kernel boot options for allowing ESXi to store coredumps on a USB device and the using the ESXi kernel boot option allowCoreDumpOnUsb=TRUE should now be used, however I was struggling to get it to work.

Since I was using a debug version of ESXi, I needed to install ESXi from scratch and I thought I could simpply add the required kernel option, as shown in the screenshot below, and I had assumed it would automatically configure the ESXi coredump file to be stored on the VMFS-L volume residing on the USB device.


After a couple of attempts, I finally realized that this particular ESXi kernel boot option, is literally that, a boot option that is only applicable after the initial ESXi installation. ? Unlike other ESXi kernel boot options which can be used during the initial installation which would apply certain configuration changes, this setting applies after ESXi has been installed. Once I appended the setting, the ESXi coredump file was created in the VMFS-L volume and I was then able to reproduce the issue and generate vm-support bundle that included the coredump!