Virt-Manager - NIC link state set to down, but guest network still connected

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It works for me on the following config:

  • KVM/QEMU @ session mode
  • VirtIO NIC @ NAT forward
  • Linux VMs

The change applies without restarting VMs.

> virsh dumpxml openwrt1 | xmllint --xpath /domain/devices/interface -
<interface type="bridge">
      <mac address="52:54:00:8b:73:59"/>
      <source bridge="virbr0"/>
      <target dev="tap0"/>
      <model type="virtio"/>
      <link state="up"/>
      <alias name="net0"/>
      <address type="pci" domain="0x0000" bus="0x00" slot="0x09" function="0x0"/>
    </interface>

> sudo virsh net-dumpxml default
<network>
  <name>default</name>
  <uuid>7ef14652-23b3-4bf8-a46e-03c40ebac980</uuid>
  <forward mode='nat'>
    <nat>
      <port start='1024' end='65535'/>
    </nat>
  </forward>
  <bridge name='virbr0' stp='on' delay='0'/>
  <mac address='52:54:00:4d:b1:00'/>
  <ip address='192.168.122.1' netmask='255.255.255.0'>
    <dhcp>
      <range start='192.168.122.2' end='192.168.122.254'/>
    </dhcp>
  </ip>
</network>

I guess this requires additional troubleshooting to isolate the issue.

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