[Unit]
Description=Network Connectivity
Wants=network.target
Before=network.target

[Service]
Type=oneshot
RemainAfterExit=yes

# lo is brought up earlier, which will cause the upcoming "ifup -a" to fail
# with exit code 1, due to an "ip: RTNETLINK answers: File exists" error during
# its "ip addr add ..." command, subsequently causing this unit to fail even
# though it is a benign error. Flushing the lo address with the command below
# before ifup prevents this failure.
ExecStart=/sbin/ip addr flush dev lo

ExecStart=/sbin/ifup -a
ExecStop=/sbin/ifdown -a

[Install]
WantedBy=multi-user.target