# Don't ifdown the interfaces on shutdown
for service in /lib/systemd/system/ifup@.service \
    /lib/systemd/system/networking.service
do
    if grep -qs '^ExecStop=.*ifdown' "$service"; then
        sed "s,^ExecStop=.*ifdown[^#]*,& --exclude=$DEVICE," -i "$service"
    fi
done
