Check the most IP connect to server
netstat -an | grep :80 | awk ‘{print $5}’ | sed -e s/’:.*’/”/g | sort | uniq -c
or
netstat -anp |grep ‘tcp\|udp’ | awk ‘{print $5}’ | cut -d: -f1 | sort | uniq -c | sort -n
or
netstat -ntu | awk ‘{print $5}’ | cut -d: -f1 | sort | uniq -c | sort -n
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