Hello,

Below is command to find out number of connections to each port using netstat, cut, awk ,uniq.

netstat -na | grep 'tcp\|udp' | awk '{print $4}' | cut -d: -f2 | sort | uniq -c | awk '{print $2}'

Here, is description for this command so many times you may face trouble because of dos attack in such case you need to find port number (service) on which dos attack is going on above command will help you to search number of connections to each port which is in use.

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