debian/ifupdown-wait-online.service

   1 [Unit]
   2 Description=Wait for network to be configured by ifupdown
   3 DefaultDependencies=no
   4 Before=network-online.target
   5 ConditionFileIsExecutable=/sbin/ifup
   6
   7 [Service]
   8 Type=oneshot
   9 ExecStart=/lib/ifupdown/wait-online.sh
  10 RemainAfterExit=yes
  11
  12 [Install]
  13 WantedBy=network-online.target