Custom firewall rules on host

[pobodysnerfect]

I believe I’ve answered this question:

Host firewalls/VPNs: a solution

Hello! ^^ So, one of the disadvantages of KVM as listed on the Wiki in Why use VirtualBox over KVM? is that it doesn’t work well with host firewalls or VPNs. The root cause of this issue lies in how Libvirt’s Virtual Networking is implemented. The relevant detail here is that libvirt inserts iptables rules to make its virtual networks work, and these tend to clash with any existing rules. Finally, after literally months of googling, learning and experimenting, I believe I’ve solved this probl…