Ночью отключали электричество, (упсы нет) а на утро обнаружил: dmesg|grep eth
udevd[391]: renamed network interface eth0 to eth2
# PCI device 0x10ec:/sys/devices/pci0000:00/0000:00:1e.0/0000:02:06.0 (r8169)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:18:c0:1b:XX:XX", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="eth*", NAME="eth2"
# PCI device 0x10ec:0x8169 (r8169)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:11:09:7f:XX:XX", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="eth*", NAME="eth0"
allow-hotplug eth0
hw ether 00:18:c0:1b:XX:XX
iface eth0 inet dhcp
dmesg|grep r8169
[ 1.231327] r8169 Gigabit Ethernet driver 2.3LK-NAPI loaded
[ 1.231383] r8169 0000:02:06.0: (unregistered net_device): not PCI Express
[ 1.248417] r8169 0000:02:06.0: eth0: RTL8110s at 0xf00b2000, 00:18:c0:1b:XX:XX, XID 04000000 IRQ 18
[ 1.248428] r8169 0000:02:06.0: eth0: jumbo features [frames: 7152 bytes, tx checksumming: ok]
ifconfig eth0 hw ether 00:11:09:7f:XX:XX
modprobe -r r8169
modprobe r8169