VMware Workstation vmnat.exe high CPU load

Vmnat.exe provides NAT services to virtual machines running in VMware Workstation. I don’t know why, but I have experienced high CPU loads of this process on Windows 7 Professional and Ultimate x64 SP0 and SP1 versions with VMware Workstation 7 and 8. I finally know how to fix it.

If you experience high CPU load from the vmnat.exe process, do the following:

Close all VM’s and VMware Workstation. Start the Virtual Network Editor from your start menu.



Now press the Restore Default button. VMware will reset all virtual interfaces.

I ended up with a Host-only network type VMNet1 and a NAT network type VMNet8. I reckon this will be the same for you.

Don’t forget to check the VM’s that need to use a NAT network connection.

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