debian/ifupdown2-pre.service

   1 [Unit]
   2 Description=Helper to synchronize boot up for ifupdown
   3 DefaultDependencies=no
   4 Wants=systemd-udevd.service
   5 After=systemd-udev-trigger.service
   6 Before=network.target
   7
   8 [Service]
   9 Type=oneshot
  10 TimeoutSec=180
  11 RemainAfterExit=yes
  12 EnvironmentFile=-/etc/default/networking
  13 ExecStart=/bin/udevadm settle