Posts Tagged ‘calculation’

How to calculate connections from IP address with shell script and log to Zabbix graphic

Thursday, March 11th, 2021

We had to test the number of connections incoming IP sorted by its TCP / IP connection state.

For example:


The reason behind is sometimes the IP address '' does create more than 200 connections, a Cisco firewall gets triggered and the connection for that IP is filtered out. To be able to know in advance that this problem is upcoming. a Small userparameter script is set on the Linux servers, that does print out all connections from IP by its STATES sorted out.


The script is is below:

#  check ESTIMATED / FIN_WAIT etc. netstat output for IPs and calculate total
# UserParameter=count.connections,(/usr/local/bin/


for i in $(netstat -nat | grep "$CHECK_IP" | awk '{print $6}' | sort | uniq -c | sort -n); do

echo -n "$i ";
echo "Total: $f"


root@pcfreak:/bashscripts# ./ 

Total: 6


root@pcfreak:/bashscripts# ./ 
Total: 5


To make process with Zabbix it is necessery to have an Item created and a Depedent Item.






Finally create a trigger to trigger alarm if you have more than or eqaul to 100 Total overall connections.


The Zabbix userparameter script should be as this:

[root@host: ~]# cat /etc/zabbix/zabbix_agentd.d/userparameter_webgui_conn.conf


Some collleagues suggested more efficient shell script solution for suming the overall number of connections, below is less time consuming version of script, that can be used for the calculation.

#!/bin/bash -x
# show FIN_WAIT2 / ESTIMATED etc. and calcuate total
count=$(netstat -n | grep "" | awk ' { print $6 } ' | sort -n | uniq -c | sort -nr)
total=$((${count// /+}))
echo "$count"
echo "Total:" "$total"

      1 TIME_WAIT
Total: 3


Below is the graph built with Zabbix showing all the fluctuations from connections from monitored IP. ebgui-check_ip_graph


Light, Camera, Action!

Wednesday, July 18th, 2007

It was a pretty hot day. In the morning we discussed a lot about the idea to move one of the colocated servers from Netinfo to Evolink. Also I have moved from one machine to another did various other Job, plamenko come home and we uploaded some of his other videos, Damqncho called and was my guest for some time ( This guy is going to become a good man in Faith I’m sure). In 6:00 we had to go to the ex-calculation center and to sign for the Cisco Academy with Mitko but it happened that he had urgent work in Balchik so I have to go alone. I used Plamenko’s bike to go to the calculation center which was located at the end of the city (Riding bike is great !). I signed for Cisco and signed also Niki (Mitko’s brother) and Niki. So we are going to share the same Cisco class! :]. After that I went to Mitko’s home to explain to his brother about the cisco way of studying. Also I forgot to mention that Doncho, has given us all the material for the semestar on a cd, we are going to have 4 semesters for the first degree, each of the semestars is going to be something like 2 months or so, the practice is going to be in Saturday. Later I have met Alex and we drink beer together. Later I saw Lily for a while and we had a walk I met Galio ( A homeless boy :[), and bought him some food, later I realised that I have lost my wallet with some money I walked again the walk where I walked after I bought him food but I didn’t found it I get a little distressed but at the same time I was feeling very calm (unusual for such a situations ). I have put my hope God would give it back. First I suspected that Galio has stolen the wallet from me but I was wrong this boy respects me. I found Galio and asked him did he stole the money, he denied to be guilty and I trusted him because he was honest. He was very kind to me he came with me looking again over all the way where I have walked at last I suggested to look in the central park where we have drinked beer together with Alex, under the bench where we have seated Me and Galio found the Wallet. And we got really happy about this. I checked my wallet there was 22 lv in there. When we was still searching the wallet I promised to God that If we found the wallet I will give 10 lv. to for his kindness and concern about my problem. After I have found the wallet I have completed my promise. Galio walked with me up to my home. The End. The only think that I can say after all this is PRAISE THE LORD, BLESS HIS HOLY NAME OH HEAVENS AND EARTH AND ALL LIVING, AND OH MY SOUL BLESS THE LORD GOD! BLESSED BE OH LORD!!!! :] END—–