tomasinouk · October 27, 2016 22:43 · Oct 27, 2016
diff --git a/SmartWorkx,Conel_check_connection_2_IP.md b/SmartWorkx,Conel_check_connection_2_IP.md
@@ -0,0 +1,58 @@
+Here is the `start-up` script, which in effect does check of 2 IP addresses
+
+```sh
+#!/bin/sh
+#
+# This script will be executed when PPP/WAN connection is established.
+#
+# Script for checking connection by two ping ip addresses
+#
+# Put checking ip addresses
+# change this to IP addresses of your SCADA, etc. servers
+PING_IPADDRESS1=8.8.8.8
+PING_IPADDRESS2=8.8.4.4
+
+# Put ping period in seconds
+PING_INTERVAL=10
+
+# Put max. failed ping count before MWAN restarting
+MAX_FAILED_PING=5
+
+PING_TIMEOUT_CNT1=0
+PING_TIMEOUT_CNT2=0
+
+while [ 1 ]
+do
+   DATE=`date +"%Y-%m-%d %H:%M:%S"`
+   PING_REPLY_TIME1=`ping -c 1 $PING_IPADDRESS1 | awk '/time=/ { print $7 }' | sed -e 's/time=//' -e 's/\.[0-9]//'`
+   if [ "$PING_REPLY_TIME1" -eq "" ]; then
+       echo "$DATE Check Connection Script: ping time-out to $PING_IPADDRESS1" >> /var/log/messages
+       if [ "$PING_TIMEOUT_CNT1" -le "$MAX_FAILED_PING" ]; then
+          PING_TIMEOUT_CNT1=$((PING_TIMEOUT_CNT1+1))
+       fi
+       echo $PING_TIMEOUT_CNT1
+   else
+       PING_TIMEOUT_CNT1=0
+   fi
+
+   PING_REPLY_TIME2=`ping -c 1 $PING_IPADDRESS2 | awk '/time=/ { print $7 }' | sed -e 's/time=//' -e 's/\.[0-9]//'`
+   if ["$PING_REPLY_TIME2" -eq ""]; then
+       echo "$DATE Check Connection Script: ping time-out to $PING_IPADDRESS2" >> /var/log/messages
+       if [ "$PING_TIMEOUT_CNT2" -le "$MAX_FAILED_PING" ]; then
+          PING_TIMEOUT_CNT2=$((PING_TIMEOUT_CNT2+1))
+       fi
+       echo $PING_TIMEOUT_CNT2
+   else
+       PING_TIMEOUT_CNT2=0
+   fi
+
+   if [ "$PING_TIMEOUT_CNT1" -ge "$MAX_FAILED_PING" ] && [ "$PING_TIMEOUT_CNT2" -ge "$MAX_FAILED_PING" ] ; then
+      echo "$DATE Check Connection Script:  Restarting MWAN connection" >> /var/log/messages
+      service ppp restart
+      exit 0
+   fi
+   sleep $PING_INTERVAL
+done
+
+```
+