For instance, if I use 2 VMs with 3 interfaces each (connected or not), I will have used 6 vmnet interfaces. The big limitation on Windows is that you are limited to 19 vmnet interfaces in total (minus the default vmnet1 and vmnet8 that we don't touch), which means you should be very careful of how many VMs with how many interface you use. Once the interfaces are added please reboot Windows so the winpcap service can discover the new interfaces. Once started you will be presented with a menu, then select option 1 which will add the vmnet interface 2 to 19 (this can take a while, please be patient). The script named 'VMnet Manager' can be found in the GNS3 install directory and via the 'Start' menu, it must be run as an Administrator (Right-click, choose 'Run as administrator'). You can manually add these interfaces using the VMware Network Configuration tool however to make your like simpler we have created script that will automatically add the vmnet interfaces. Once installed, you must create additional vmnet interfaces which will be used by your VMware VMs to communicate with other devices running in GNS3. VMware Player Pro can also be used but don't forget to install the VIX API after. Installing VMware Workstation should be painless. Player is fine but requires a bit more setup time because you must also install the VIX API which include the vmrun tool allowing GNS3 to control the VMs. We recommend using VMware Workstation over Player if you can afford it. Please not that VMware Fusion is not supported at the moment and only VMware Player and Workstation version 11 on Windows and Linux have been tested. However, VMware doesn't make GNS3's job easy and the setup process is going to be critical to successfully have your VMs work. VMware VMs can be added to your projects in the same way as VirtualBox VMs. Pessoal, agora a tarde acabou de ser lançado a nova versão do GNS3 que agora contará com suporte à VMware (antes era suportado a integração apenas com o Virtual Box), como ainda não testei, segue o post do Jeremy (criador) do que mudou:

Vix api gns3