WilliamLam.com

  • About
    • About
    • Privacy
  • VMware Cloud Foundation
  • VKS
  • Homelab
    • Hardware Options
    • Hardware Reviews
    • Lab Deployment Scripts
    • Nested Virtualization
    • Homelab Podcasts
  • VMware Nostalgia
  • Apple

Nested ESXi 5.1 Supports VMXNET3 Network Adapter Type

09.11.2012 by William Lam // 15 Comments

I noticed something interesting while extracting the contents of ESXi 5.1 ISO for some kickstart configurations ....

Do you see it? It's a VMXNET3 driver for the VMkernel! I also confirmed by running the following ESXCLI command querying for the VMkernel module "vmxnet3":

# esxcli system module get -m vmxnet3
Module: vmxnet3
Module File: /usr/lib/vmware/vmkmod/vmxnet3
License: GPL
Version: Version 1.1.32.0, Build: 799733, Interface: 9.2 Built on: Aug  1 2012
Signed Status:
Signature Issuer:
Signature Digest:
Signature FingerPrint:
Provided Namespaces:
Required Namespaces: [email protected], com.vmware.vmkapi@v2_1_0_0

***Disclaimer***: This is for educational purposes only, this is not officially supported by VMware. Use at your own risk. There is also a mention of this in the vSphere 5.1 release notes that VMs running on nested ESXi hosts using VMXNET3 driver could potentially crash. Again, not supported user at your own risk.

Next I decided to create a Nested ESXi 5.1 VM, but instead of selecting the e1000 driver which was the only network adapter type that would function for running a nested ESXi host, I choose the VMXNET3 adapter and to my surprise ESXi's networking stack was fully functional.

You can see from the above screenshot, I have a two VMXNET3 network adapters for my nested ESXi 5.1 VM. Here are two additional screenshot of the physical adapters as seen by nested ESXi 5.1 host and you can see that it shows up as VMware Inc. VMXNET3

I have not tried any performance tests, so not sure if there are going to be any significant benefits but pretty cool nonetheless!

Categories // Uncategorized Tags // ESXi 5.1, nested, vesxi, vmxnet3, vSphere 5.1

  • « Previous Page
  • 1
  • 2

Search

Thank Author

Author

William is Distinguished Platform Engineering Architect in the VMware Cloud Foundation (VCF) Division at Broadcom. His primary focus is helping customers and partners build, run and operate a modern Private Cloud using the VMware Cloud Foundation (VCF) platform.

Connect

  • Bluesky
  • Email
  • GitHub
  • LinkedIn
  • Mastodon
  • Reddit
  • RSS
  • Twitter
  • Vimeo

Recent

  • NVMe Tiering with Nested Virtualization in VCF 9.0 06/20/2025
  • VCF 9.0 Installer workaround for ESXi hosts with different vendor 06/19/2025
  • NVMe Tiering with AMD Ryzen CPU workaround for VCF 9.0 06/19/2025
  • vSAN ESA Disk & HCL Workaround for VCF 9.0 06/19/2025
  • Disable 10GbE NIC Pre-Check in the VCF 9.0 Installer 06/19/2025

Advertisment

Privacy & Cookies: This site uses cookies. By continuing to use this website, you agree to their use.
To find out more, including how to control cookies, see here: Cookie Policy

Copyright WilliamLam.com © 2025