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If you are happy playing around with iptables rulesets, you could count with it (although there are a number of situations in which this idea might not be a particularly good one; eg, you have no experience with iptables, you don't have an existing firewall, except set up via a gui tool that doesn't do this, its a production server that you daren't mess around with, etc, etc).
I have a simple question, How can we count packets towards the following IP from my server.
# tcpdump host 100.400.120.140
Upon termination (Ctrl+C), tcpdump will show the number of packets captured. If you need these tracked over a long period of time, you should probably point the output to a dump file. See the tcpdump(8) manpages.