[Unit]
Description=DHCP client daemon for IPv4 on %I
BindTo=dev-%I.device
After=dev-%I.device

[Service]
Restart=on-failure
ExecStartPre=/usr/lib/network/dhclient-helper start %I ipv4
ExecStart=/usr/sbin/dhclient -d %I -4 \
	-cf /run/network/dhclient/%I/dhclient4.conf \
	-lf /var/lib/dhclient/dhclient-%I.leases \
	-pf /run/network/dhclient/%I/dhclient4.pid
ExecStop=/usr/lib/network/dhclient-helper stop %I ipv4

# This could be used if you want to release a lease.
#ExecStop=/usr/sbin/dhclient -d -r %I -4 \
#	-cf /run/network/dhclient/%I/dhclient4.conf \
#	-lf /var/lib/dhclient/dhclient-%I.leases \
#	-pf /run/network/dhclient/%I/dhclient4.pid

UtmpIdentifier=%I