#!/bin/bash

while true; do
  for octet in 11 12 13 14 15 21 22 23 24 25; do
    echo "${octet}:"
    ping -t1 -a -c1 192.168.17.${octet} | grep -E "(transmitted)"
  done
  echo ""
  echo "-------------------------------------------------------------"
  echo ""
  sleep 10
done