[Unit]
Description=DHCPv4 client for %I
Before=network-online.target
Before=network.target

[Service]
Type=forking
RuntimeDirectory=dhclient
ExecStart=/usr/sbin/dhclient -4 -1 -lf /run/dhclient/%I.lease -pf /run/dhclient/%I.pid
PIDFile=/run/dhclient/%I.pid

[Install]
WantedBy=multi-user.target