Tip #3: Adding additional networks to VMware Fusion 4/5

So, you are studying for a networking certification. Maybe CCNA or CCNP, maybe F5 or Juniper. You need multiple interfaces to run GNS3/Dynamips (A graphical network simulator & Cisco IOS emulator) or your favorite networking tool. Alas, the default configuration of VMWare Fusion just has the basic VMnet1 and VMnet8.

Well… that sucks. What can we do about it? Let’s add some!

You have plenty of available vmnet[2-7] to add more host-only networks to for working with GNS3.

VMWare Fusion 4 makes this SO simple. No more dealing with obnoxious boot.sh and custom setups, complex files. You just edit 1 file, and restart VMware Fusion 4. (Meaning quit and reopen the app)

Open a Terminal window (Applications > Utilities > Terminal) Goto the VMware Fusion preferences directory, and edit the networking file.

You will see this:

Paste in the following text in BETWEEN the VMNET_1 and VMNET_8 settings. You can change the IPs to suit your needs.

Save your file, and restart VMware Fusion 4. That is! You are done!

If you ifconfig you will see all your new interfaces.


To use it.. you would simply update your vmx file of your vm to specify which network to link to:


It’s just that easy!



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