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Full Discussion: Log of lost internet connections
Top Forums Shell Programming and Scripting Log of lost internet connections Post 303028686 by bakunin on Saturday 12th of January 2019 05:18:40 PM
Old 01-12-2019
Quote:
Originally Posted by drew77
I would like for it to only log pings that generate 100% packet loss. Thanks..

Code:
while true; do

date >> Internet_Connection_Log.txt
echo >> Internet_Connection_Log.txt
ping  47.182.239.232 -c 1 >> Internet_Connection_Log.txt
echo >> Internet_Connection_Log.txt
sleep 180
done

Make the logging dependent on the RC of ping:

Code:
while : ; do
     if ! ping  -c 1 47.182.239.232 ; then
          printf "\n%s\n" "ping failed at $(date)" >> Internet_Connection_Log.txt
     fi
     sleep 180
done

But wouldn't a log with start- and end-times of failures be better? Note that this makes sense only if the blocks of good and failing internet connections are longer - if it works 10 minutes, then fails for 10 minutes this would make sense, if every second ping fails but every other packet gets through this would create a very large log:

Code:
lFail=0
while : ; do
     if (( lFail )) ; then
          if ping  -c 1 47.182.239.232 ; then
               printf "\n%s\n" "ping worked again at $(date)" >> Internet_Connection_Log.txt
               lFail=0
          fi
     else
          if ! ping  -c 1 47.182.239.232 ; then
               printf "\n%s\n" "ping stopped working at $(date)" >> Internet_Connection_Log.txt
               lFail=1
          fi
     fi
     sleep 1
done

I hope this helps.

bakunin
 

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LEARN ABOUT DEBIAN

mrtg-ping-probe

MRTG-PING-PROBE(1)					      General Commands Manual						MRTG-PING-PROBE(1)

NAME

       mrtg-ping-probe - ping probe module for Multi Router Traffic Grapher

DESCRIPTION

       mrtg-ping-probe is a ping probe module for MRTG 2.x.  It is used to monitor the round trip time and packet loss to networked devices.  MRTG
       uses the output of mrtg-ping-probe to generate graphs visualizing minimum and maximum round trip times or packet loss.

       mrtg-ping-probe is not run directly, but is called by MRTG as a helper when it needs to determine ping time to a host.

       Act responsibly: do not use mrtg-ping-probe to ping devices without the owner's permission.  Just imagine if 10,000 people decided to  ping
       your hosts!  mrtg-ping-probe is meant to be used within your network to get round trip time performance figures for your network.

OPTIONS

       To  use	mrtg-ping-probe you need to configure MRTG to call it from within the definition of a target host. This is done in the MRTG config
       file, which is usually /etc/mrtg.conf.

       Here's an example snippet: change the target name and IP address to suit your needs.

       Target[your.target.ping]: `/usr/bin/mrtg-ping-probe 123.456.789.123`
       SetEnv[your.target.ping]: MRTG_INT_IP="123.456.789.123" MRTG_INT_DESCR="ping"
       MaxBytes[your.target.ping]: 100
       AbsMax[your.target.ping]: 200
       Options[your.target.ping]: gauge, growright
       YLegend[your.target.ping]: ping time (ms)
       ShortLegend[your.target.ping]: ms
       Legend1[your.target.ping]: Maximum Round Trip Time in ms
       Legend2[your.target.ping]: Minimum Round Trip Time in ms
       Legend3[your.target.ping]: Maximal 5 Minute Maximum Round Trip Time in ms
       Legend4[your.target.ping]: Maximal 5 Minute Minimum Round Trip Time in ms
       LegendI[your.target.ping]:  Max:
       LegendO[your.target.ping]:  Min:

       Pay close attention to the backticks in the first line which tell MRTG to execute the nominated external program. Note also that  you  need
       to use the "gauge" option, since the results of subsequent ping probes are independant values and not an incrementing counter.

SEE ALSO

       mrtg(1).

       The latest release of mrtg-ping-probe can be found on the web at http://pwo.de/projects/mrtg/

AUTHOR

       This manual page was written by Jonathan Oxer <jon@debian.org>, for the Debian project (but may be used by others).

								  April 14, 2003						MRTG-PING-PROBE(1)
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