[Unit]
Description=home storage folder
After=remote-fs-pre.target
After=network.target
After=network-online.target
Wants=network-online.target
BindsTo=network-online.target
Conflicts=umount.target
Before=umount.target

[Mount]
What=//172.16.100.1/storage
Where=/home/username/Shared/storage
Type=cifs
Options=noauto,x-systemd.automount,noexec,noperm,iocharset=utf8,uid=1000,gid=1000,credentials=/etc/share_creds/home_samba

[Install]
WantedBy=remote-fs.target

#!/bin/bash
while read -r line; do
    [[ "$line" =~ deactivating ]] && {
        /bin/systemctl stop home-username-Shared-storage.mount
    }
done < <(LANG=en_US nmcli monitor)

[Unit]
Description=automounts home storage share
Requires=NetworkManager.service home-connection-monitor.service

[Automount]
Where=/home/<username>/Shared/storage
TimeoutIdleSec=301

[Install]
WantedBy=remote-fs.target

[Unit]
Description=home storage folder
Requires=NetworkManager.service home-connection-monitor.service
After=home-connection-monitor.service

[Mount]
What=//<local-share-ip>/storage
Where=/home/<username>/Shared/storage
Type=cifs
Options=nofail,_netdev,noauto,iocharset=utf8,uid=<user_uid>,gid=<user_gid>,credentials=</path/to/file/with/credentials>
ForceUnmount=yes
LazyUnmount=yes
TimeoutSec=5

[Unit]
Description=home connection monitor
After=home-<username>-Shared-storage.automount
Requires=NetworkManager.service home-<username>-Shared-storage.automount

[Service]
Type=simple
ExecStart=/usr/local/bin/home-connection-monitor
Restart=on-failure

[Install]
WantedBy=remote-fs.target

#!/bin/bash
host='<local-share-ip>'
vpn_connection_name='<yor-vpn-connection-name>'
test_internet_host='208.67.222.222' # к примеру, можно любой доступный только через интернет.

connect_to_home()
{
    printf '%sn' "$(date +"%d_%m_%Y %H:%M:%S") Trying connecting to ${host}" # Задел на будущее для создания лог файла
    until ping -W2 -c1 "${test_internet_host}" &>/dev/null; do
        ping -W1 -c1 "${host}"  &>/dev/null && break
        sleep 1
    done
    ping -W1 -c1 "${host}"  &>/dev/null && {
        printf "$(date +"%d_%m_%Y %H:%M:%S") Connection for ${host} [ \e[32m%s\e[m ]\n" 'established'
        return 0
    }
    until ping -W1 -c1 "${host}" &>/dev/null; do

        if nmcli con up "${vpn_connection_name}"; then
            if ping -W1 -c1 "${host}" &>/dev/null; then
                printf "$(date +"%d_%m_%Y %H:%M:%S") Connection for ${host} [ \e[32m%s\e[m ]\n" 'established'
                return 0
            fi
        else
            sleep 2
        fi

    done
}

connect_to_home && {
    while ping -W1 -c1 "${host}" &>/dev/null; do
        sleep 1
    done
    exit 1
}