QEMU Windows 11 guest cannot access internet

[simonflick]

Happy new year 🙂

I have migrated a VM to a fresh CachyOS installation but it could not access the internet.

Setting firewall_backend = "iptables" in /etc/libvirt/network.conf fixed it. Maybe this could be added to QEMU and VMM Setup or made a default config.

My VM network configuration differs from the default:

<interface type="network">
  <mac address="#######"/>
  <source network="default" portid="#######" bridge="virbr0"/>
  <target dev="vnet2"/>
  <model type="virtio"/>
  <link state="up"/>
  <alias name="net0"/>
  <address type="pci" domain="0x0000" bus="0x01" slot="0x00" function="0x0"/>
</interface>

I think I did this because it is supposed to improve performance. Maybe this tweak is only needed for such a network interface. But I'm no expert on QEMU.