How to do a packet capture (tcpdump)
Estimated Reading Time: < 1 MinuteSample Command on how to use TCP Dump
Linux: tcpdump -w {filename}.pcap  -c 200 {limit number of packets}
tcpdump -s 2000 -w dump.pcap
Then you can email the file to any one using command
mail -s "dump.pcap" email@gmail.com < dump.pcap
You can then open with file w/ Wireshark
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http://www.thegeekstuff.com/2010/08/tcpdump-command-examples/