replace ping by nc to circumvent errors when ICMP requests are blocked on a remote host

monitor.sh

@@ -31,7 +31,11 @@ function mailsend {
 }
 
 function pingtest {
-    ping -c3 -W3 -q $1 >> /dev/null
+    #ping -c3 -W3 -q $1 >> /dev/null
+    #timeout 5 bash -c 'echo "ping" > /dev/tcp/$1/80'; echo $?
+
+    nc -z -w3 $1 80 > /dev/null
+    
     PSTATUS=$(echo $?)
 }