$ virsh net-info default Name: default UUID: 5db32803-fd1e-4876-98d8-da194f535c17 Active: yes Persistent: yes Autostart: yes Bridge: virbr0 $ virsh net-dumpxml default default 5db32803-fd1e-4876-98d8-da194f535c17 from the journal: Okt 15 17:18:06 juergen kernel: virbr0: port 2(vnet0) entered blocking state Okt 15 17:18:06 juergen kernel: virbr0: port 2(vnet0) entered disabled state Okt 15 17:18:06 juergen kernel: device vnet0 entered promiscuous mode Okt 15 17:18:06 juergen kernel: virbr0: port 2(vnet0) entered blocking state Okt 15 17:18:06 juergen kernel: virbr0: port 2(vnet0) entered listening state Okt 15 17:18:06 juergen NetworkManager[1653]: [1539616686.7302] manager: (vnet0): new Tun device (/org/freedesktop/NetworkManager/Devices/8) Okt 15 17:18:06 juergen systemd-udevd[7327]: link_config: autonegotiation is unset or enabled, the speed and duplex are not writable. Okt 15 17:18:06 juergen NetworkManager[1653]: [1539616686.7453] devices added (path: /sys/devices/virtual/net/vnet0, iface: vnet0) Okt 15 17:18:06 juergen NetworkManager[1653]: [1539616686.7454] device added (path: /sys/devices/virtual/net/vnet0, iface: vnet0): no ifupdown configuration found. Okt 15 17:18:06 juergen NetworkManager[1653]: [1539616686.7470] device (vnet0): state change: unmanaged -> unavailable (reason 'connection-assumed', sys-iface-state: 'external') Okt 15 17:18:06 juergen NetworkManager[1653]: [1539616686.7513] keyfile: add connection in-memory (697f6001-f8b1-4acc-bc69-b562c78a1372,"vnet0") Okt 15 17:18:06 juergen NetworkManager[1653]: [1539616686.7546] device (vnet0): state change: unavailable -> disconnected (reason 'connection-assumed', sys-iface-state: 'external') Okt 15 17:18:06 juergen NetworkManager[1653]: [1539616686.7570] device (vnet0): Activation: starting connection 'vnet0' (697f6001-f8b1-4acc-bc69-b562c78a1372) Okt 15 17:18:06 juergen libvirtd[1706]: 2018-10-15 15:18:06.757+0000: 1776: error : virNetDevSendEthtoolIoctl:3071 : ethtool ioctl error: No such device Okt 15 17:18:06 juergen libvirtd[1706]: 2018-10-15 15:18:06.758+0000: 1776: error : virNetDevSendEthtoolIoctl:3071 : ethtool ioctl error: No such device Okt 15 17:18:06 juergen NetworkManager[1653]: [1539616686.7576] device (vnet0): state change: disconnected -> prepare (reason 'none', sys-iface-state: 'external') Okt 15 17:18:06 juergen libvirtd[1706]: 2018-10-15 15:18:06.758+0000: 1776: error : virNetDevSendEthtoolIoctl:3071 : ethtool ioctl error: No such device Okt 15 17:18:06 juergen NetworkManager[1653]: [1539616686.7588] device (vnet0): state change: prepare -> config (reason 'none', sys-iface-state: 'external') Okt 15 17:18:06 juergen NetworkManager[1653]: [1539616686.7595] device (vnet0): state change: config -> ip-config (reason 'none', sys-iface-state: 'external') Okt 15 17:18:06 juergen NetworkManager[1653]: [1539616686.7600] device (virbr0): bridge port vnet0 was attached Okt 15 17:18:06 juergen NetworkManager[1653]: [1539616686.7600] device (vnet0): Activation: connection 'vnet0' enslaved, continuing activation Okt 15 17:18:06 juergen NetworkManager[1653]: [1539616686.7605] device (vnet0): state change: ip-config -> ip-check (reason 'none', sys-iface-state: 'external') Okt 15 17:18:06 juergen NetworkManager[1653]: [1539616686.7622] device (vnet0): state change: ip-check -> secondaries (reason 'none', sys-iface-state: 'external') Okt 15 17:18:06 juergen NetworkManager[1653]: [1539616686.7627] device (vnet0): state change: secondaries -> activated (reason 'none', sys-iface-state: 'external') Okt 15 17:18:06 juergen NetworkManager[1653]: [1539616686.7787] device (vnet0): Activation: successful, device activated. the virbr0.status file stays 'empty', the virbr0.macs file contains: [ { "domain": "win7", "macs": [ "52:54:00:41:51:b4" ] } ] hth, Jürgen