$ ls -alF /sys/class/net total 0 drwxr-xr-x 2 root root 0 Feb 20 23:00 ./ drwxr-xr-x 38 root root 0 Feb 20 23:00 ../ lrwxrwxrwx 1 root root 0 Feb 20 23:00 br0 -> ../../devices/virtual/net/br0/ lrwxrwxrwx 1 root root 0 Feb 20 23:00 eth0 -> ../../devices/pci0000:00/0000:00:19.0/net/eth0/ lrwxrwxrwx 1 root root 0 Feb 20 23:00 eth0.10 -> ../../devices/virtual/net/eth0.10/ lrwxrwxrwx 1 root root 0 Feb 20 23:00 eth0.3 -> ../../devices/virtual/net/eth0.3/ lrwxrwxrwx 1 root root 0 Feb 20 23:00 lo -> ../../devices/virtual/net/lo/ lrwxrwxrwx 1 root root 0 Feb 20 23:00 vnet0 -> ../../devices/virtual/net/vnet0/
$ ls -alF /sys/class/net virtual/ net/br0/ pci0000: 00/0000: 00:19.0/ net/eth0/ virtual/ net/eth0. 10/ virtual/ net/eth0. 3/ virtual/ net/lo/ virtual/ net/vnet0/
total 0
drwxr-xr-x 2 root root 0 Feb 20 23:00 ./
drwxr-xr-x 38 root root 0 Feb 20 23:00 ../
lrwxrwxrwx 1 root root 0 Feb 20 23:00 br0 -> ../../devices/
lrwxrwxrwx 1 root root 0 Feb 20 23:00 eth0 -> ../../devices/
lrwxrwxrwx 1 root root 0 Feb 20 23:00 eth0.10 -> ../../devices/
lrwxrwxrwx 1 root root 0 Feb 20 23:00 eth0.3 -> ../../devices/
lrwxrwxrwx 1 root root 0 Feb 20 23:00 lo -> ../../devices/
lrwxrwxrwx 1 root root 0 Feb 20 23:00 vnet0 -> ../../devices/