Newbee: Trouble with this "easy" script

[JackNY]

test_address="8.8.8.8"                                          
tunnel_interfaceWAN="eth0"                                      
tunnel_interfaceVPN="tun1"                                      
init_ping_tries=2    

ping_tries=init_ping_tries
WANup=0

while  [[ $ping_tries -lt 5] && [ $WANup -eq 0 ]]
do
        if ping -c 1 -W 1 $test_address -I $tunnel_interfaceWAN >/dev/null
  then
                WANup=1
        fi
        ping_tries=$((ping_tries+1))
done

if $WANup -eq 0
  then
        echo "VPN is down because Internet is down [exit 0]"
        exit 0
fi

Im pretty new to bash programming, this script should be simple, but I cant seem to figure out why it is not working correctly.

Is there something wrong with the syntax of my while loop or last if statement?

 

Edited June 27, 2022 by JackNY