Creating a new NAT network in virt-manager

I created a new network – called virbr1

<network connections="1">
  <name>virbr1</name>
  <uuid>a4ca0fc9-06e7-4ad6-8fad-e8b1865a6877</uuid>
  <forward mode="nat">
    <nat>
      <port start="1024" end="65535"/>
    </nat>
  </forward>
  <bridge name="virbr1" stp="on" delay="0"/>
  <mac address="52:54:00:b7:af:d0"/>
  <domain name="virbr1"/>
  <ip address="192.168.100.1" netmask="255.255.255.0">
    <dhcp>
      <range start="192.168.100.128" end="192.168.100.254"/>
    </dhcp>
  </ip>
</network>allow virbr0<br />allow br0<br />allow virbr1

Note: in order to add a network with virt-manager gui one must run as root.

When I connected a VM to this – I got the following error:

 

usr/libexec/qemu-bridge-helper --use-vnet --br=virbr1 --fd=41: failed to communicate with bridge helper: stderr=>
                                            : Transport endpoint is not connected

In the gui – it says “access denied by acl file

Error starting domain: /usr/libexec/qemu-bridge-helper --use-vnet --br=virbr1 --fd=41: failed to communicate with bridge helper: stderr=access denied by acl file
: Transport endpoint is not connected

 

The solution is the to edit the /etc/qemu/bridge.conf.  Add allow virbr1.  this allows non-root users to access the bridge

 

allow virbr0
allow br0
allow virbr1