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Log of lost internet connections

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# 1  
Old 01-12-2019
Log of lost internet connections
I am having a big problem with lost internet connections with my DSL.

I would like to create a log to be able to show the technician when he comes next week.

I would like for it to only log pings that generate 100% packet loss. Thanks..

This script generates all ping attempts including successful ones.

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

Moderator's Comments:
Mod Comment edit bybakunin: Please use CODE-tags when posting code, data or terminal output. It is not only in the rules, it is the sensible thing to do. Thank you.
Last edited by bakunin; 01-12-2019 at 06:03 PM..
# 2  
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
# 3  
Old 01-12-2019
Thanks.

I will try the first one you listed.

My lost connections only last about 30 seconds until the modem re-connects.

--- Post updated at 04:58 PM ---

It worked great.

Code:
ping failed at Sat Jan 12 16:56:28 CST 2019

I noticed I am getting dropped connections about every 20 minutes.
# 4  
Old 01-12-2019
So you want a log of the ups and downs of your DSL connection? Depending on your ping version (ping -V, mine is "ping utility, iputils-s20180629"), a single command might suffice:
Code:
ping -Di5 router
PING router.domain.De (192.168.0.1) 56(84) bytes of data.
[1547335266.088652] 64 bytes from router.domain.De (192.168.0.1): icmp_seq=1 ttl=64 time=1.67 ms
[1547335271.094225] 64 bytes from router.domain.De (192.168.0.1): icmp_seq=2 ttl=64 time=1.44 ms
[1547335276.099867] 64 bytes from router.domain.De (192.168.0.1): icmp_seq=3 ttl=64 time=1.48 ms

Adapt the interval (-i) value to the desired granularity.
# 5  
Old 01-12-2019
I just need the times when router is down.

Added this for an audio reminder.

Code:
cvlc --play-and-exit /usr/share/sounds/My_Sounds/Alarm-sound-buzzer.mp3

Last edited by drew77; 01-12-2019 at 08:39 PM..
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