Hi,

Like many here, I have been a long time user of Fusion on Mac OS X. 

I have a very odd problem I never encountered before... basically, networking on any of my Fusion 12 VM does not work anymore since upgrading to Big Sur, but even worse... when I quite Fusion, now my network/internet access on my Mac stops too! No matter how much I try to stop/start the Mac networking service (ifconfig up/down on en0) it doesn't work... I am left with having to reboot the Mac to get my connectivity back!

Here is what I have done:

Catelina + Fusion 11

Then upgraded to Fusion 12.

Everything works fine, I have a mix of Ubuntu and Windows 10 VMs.

Then upgraded to Big Sur.

Then upgraded to the latest version of Fusion 12.

None of the VM network is working and when I exit VMware the native Mac OS X network stops working. In fact the Mac OS X network even breaks sometimes whilst using some VM.

I have no issue with my Mac network as long as I do not run Fusion...

I have tried to remove Fusion 12 completely (in /Application, /Library) then reinstall Fusion 12 by downloading the latest image, then removed all my VM and just started installing a new VM from scratch (a Kali Linux image) and right in the middle of the installation the network stops working on my Mac.

I have little snitch installed, but appart from that nothing else that should be related to the network.

I have tried to remove little snitch and also redo everything else (install fo Fusion 12 + setup of new VM) and I still get the same issue.

I am running the latest Big Sur on 11.2.3

Any helps and pointers to troubleshoot the issue is welcome!

Thanks..

S.