If you think your Linux box is under attack, print out a list of open connections on your box and sorts them by according to IP address, enter:
# netstat -atun | awk '{print $5}' | cut -d: -f1 | sed -e '/^$/d' |sort | uniq -c | sort -n
Output:
1 10.0.77.52 2 10.1.11.3 4 12.109.42.21 6 12.191.136.3 ..... ... .... 13 202.155.209.202 18 208.67.222.222 28 0.0.0.0 233 127.0.0.1
ref : http://www.cyberciti.biz/tips/netstat-command-tutorial-examples.html
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