If I were to install firewalls on each virtual machine, this would probably bottleneck the network connectivity I have between the host OS and guest OSes. Each virtual machine has its own connection to a virtual network. The ones that Comodo failed, I am sure, even some better known.

It's generally accepted that the most significant risks are external/public facing or are facilitated by entirely different components such as the USB controller, and firewalls can be seen as a nuisance to some. Comodo really looks like promising firewall, and as far as I know, it passed all those tests. In fact, don't necessarily use this as an example but many home networks go without firewalls on local workstations, with the exception of perhaps one in the form of home router/modem combination. Stay safe with the award winning Comodo Firewall. I don't think you should exclude your other options. Comodo antivirus and firewall stops hackers from accessing your computer by scanning and blocking any and all malware from entering your computer, and preventing unauthorized access to or from your network. Special Features: Unlimited Product Support.

Choose the best choice you can, meaning the one which offers the best comprehensive protection against network-based attacks, on a per-network basis. Protect your personal files and photos being stolen by hackers. Comodo FirewallAlternatives and Competitors Azure Firewall Quantum Flare Azure Web Application Firewall Huawei Firewall Cisco Adaptive Security Virtual. To be clear, you should not use more than one firewall per computer.

Comodo personal firewall