Note on using a NAT in a qemu/kvm VM
June 8, 2025
A short one today, since I wanted to share my easy fix to a seemingly not so easy problem I recently encountered.
When running a VM on Linux using the qemu/kvm, you might encounter issues with giving the VM internet access, despite configuring the NAT properly, and installing the virtio drivers.
The trick (assuming you're running iptables) is to edit /etc/libvirt/network.conf, and
uncomment the probably last line, # firewall_backend = "iptables"
Truth be told, this article is more of a note for myself running future VMs on Linux, given this problem continues to exist, but who knows, if it helps even one other person beside myself, I'd be very glad.