I have a feeling it is something very basic I'm missing here but this is driving me nuts at the moment. I can't get bridging to work in a persistent way between the guests and the outside world on my server. The system is an old HP i7 2600 desktop with 32GB of ram running Ubuntu 16.04 x86 server. It has one NIC, eno1. That NIC is set to run dot1q via a switch to a firewall. The VM's are running QEMU. eno1.11 is used for host management and working fine. eno1.27 is used for the guests to reach the host and external connectivity. On VLAN 27 I use 10.71.4.129 for the external firewall, 10.71.4.130 for the host and 10.71.4.131 for the guest (once the first one is working it will be 6 guests). Code: cat /etc/network/interfaces auto lo iface lo inet loopback auto eno1.11 iface eno1.11 inet static address 10.71.1.10 netmask 255.255.255.192 gateway 10.71.1.1 dns-nameservers 126.96.36.199 188.8.131.52 vlan-raw-device eno1 auto eno1.27 iface eno1.27 inet manual vlan-raw-device eno1 First I created bridge "br0" here with IP 10.71.4.130 and attached eno1.27 to it. In the Virsh xml file for the VM I pointed the interface to bridge br0. No errors when starting up the VM, except the VM couldn't reach anything but the host could reach the firewall. So next was to scrap the br0 in /etc/network/interfaces and use the net-create function in Virsh using this xml: Code: cat host-bridge.xml <network> <name>host-bridge</name> <bridge name="virbr9"/> <forward mode="route" dev="eno1.27"/> <ip address="10.71.4.130" netmask="255.255.255.240"> </ip> </network> After tweaking the VM xml to use virbr9 I had connectivity between the host and the guest but neither could reach the firewall. Next was to try and attach the eno1.27 interface to virbr9 manually: Code: brctl addif virbr9 eno1.27 Code: brctl show virbr9 bridge name bridge id STP enabled interfaces virbr9 8000.525400820772 yes eno1.27 virbr9-nic vnet0 At this stage everything is working, firewall, host and guest can all reach each other. How do I get this working whenever the server is rebooted as the brctl command isn't persistent? Any help is appreciated.