Asuswrt WAN monitor

wan-monitor.sh

#!/bin/sh

# [Asuswrt WAN monitor]
#
# The script is quite simple:
# - If we have internet connection (succeeded ping), sleep 1 second and set the fail counter to zero.
# - Else: If is bigger than the limit set => write in the system log*, reset the WAN and sleep 30 seconds.
#
# * Visible on <<YOUR_ASUS_ROUTER_IP>>/Main_LogStatus_Content.asp

# Usage:
# 1) Add this script on /jffs/scripts/
# 2) Ensure execution permission running: chmod +x wan-monitor.sh
# 3) Add the script into the startup service: echo "sh /jffs/scripts/wan-monitor.sh & # wan-monitor" >> /jffs/scripts/services-start
# 4) Reboot your router. Enjoy.

TARGET="google.com"
COUNT=0
MAX_FAILING=5

while true
do
  ping -c 1 $TARGET > /dev/null 2>&1
  PING=$?

  if [ $PING = 0 ] ; then
    COUNT=0
    sleep 1

  else

    if [ "$COUNT" -gt "$MAX_FAILING" ]; then
      logger -t wan-monitor "Restarting WAN..."
      service restart_wan
      sleep 30
    fi

    COUNT=$((COUNT+=1))
    sleep 1

  fi

done