Про новый udev и ppp0

$ udevadm test-builtin net_id /sys/class/net/eth0 2> /dev/null

udevadm  test /sys/class/net/ppp0/ 2>/dev/null

# udevadm  test /sys/class/net/ppp0/ 2>/dev/null
This program is for debugging only, it does not run any program
specified by a RUN key. It may show incorrect results, because
some values may be different, or not available at a simulation run.
ACTION=add
DEVPATH=/devices/virtual/net/ppp0
IFINDEX=4
INTERFACE=ppp0
SUBSYSTEM=net
USEC_INITIALIZED=107340279658
run: 'net.sh ppp0 start'
# udevadm test /sys/class/net/eth0/ 2>/dev/null
This program is for debugging only, it does not run any program
specified by a RUN key. It may show incorrect results, because
some values may be different, or not available at a simulation run.
ACTION=add
DEVPATH=/devices/pci0000:00/0000:00:14.4/0000:03:06.0/net/eth0
ID_BUS=pci
ID_MODEL_ID=0x1229
ID_NET_NAME_MAC=enx00508b111b25
ID_NET_NAME_PATH=enp3s6
ID_OUI_FROM_DATABASE=Hewlett-Packard Company
ID_PCI_CLASS_FROM_DATABASE=Network controller
ID_PCI_SUBCLASS_FROM_DATABASE=Ethernet controller
ID_PRODUCT_FROM_DATABASE=NC3121 Fast Ethernet NIC (WOL)
ID_VENDOR_FROM_DATABASE=Intel Corporation
ID_VENDOR_ID=0x8086
IFINDEX=2
INTERFACE=eth0
SUBSYSTEM=net
USEC_INITIALIZED=491703
run: 'net.sh eth0 start'