Archive for the tag 'netstat'

SBDavid
Jul 16th, 2010

Using netstat to find largest number of established connections

Using netstat to find largest number of established connections

To find out the largest number of established connections you can simply use something like

netstat -an | grep ‘ESTABLISHED’ | awk ‘{print $4}’ | cut -d: -f1 | uniq -c | sort -rn | head -n 1
3 192.168.1.2

To see the list of the top 10

netstat -an | grep ‘ESTABLISHED’ | awk ‘{print $4}’ | cut -d: -f1 | uniq -c | sort -rn | head -n 10
2 192.168.1.2

How to view all

netstat -an | grep ‘ESTABLISHED’ | awk ‘{print $4}’ | cut -d: -f1 | uniq -c | sort -rn
3 192.168.1.2

You can also view all but have pages so you can view each in detail

netstat -an | grep ‘ESTABLISHED’ | awk ‘{print $4}’ | cut -d: -f1 | uniq -c | sort -rn | more
8 192.168.1.2

You can show the port with:

netstat -an | grep ‘ESTABLISHED’ | awk ‘{print $4}’ | uniq -c | sort -rn
1 192.168.1.2:58632
1 192.168.1.2:58631
1 192.168.1.2:58629
1 192.168.1.2:58628
1 192.168.1.2:58627
1 192.168.1.2:58613
1 192.168.1.2:55154
1 192.168.1.2:48673
SBDavid
May 28th, 2009

Using Netstat

To find out the largest number of established connections you can simply use something like

netstat -an | grep ‘ESTABLISHED’ | awk ‘{print $4}’ | cut -d: -f1 | uniq -c | sort -rn | head -n 1

To see the list of the top 10

netstat -an | grep ‘ESTABLISHED’ | awk ‘{print $4}’ | cut -d: -f1 | uniq -c | sort -rn | head -n 10

To view all

netstat -an | grep ‘ESTABLISHED’ | awk ‘{print $4}’ | cut -d: -f1 | uniq -c | sort -rn
SBDavid
May 21st, 2009

Count the number of connections each IP makes

Count the number of connections each IP makes

Use netstat command to calculate and count the number of connections each IP address makes to the server.

netstat -anp |grep ‘tcp\|udp’ | awk ‘{print $5}’ | cut -d: -f1 | sort | uniq -c | sort -n

netstat - Print network connections, routing tables, interface statistics, masquerade connections, and multicast memberships