How to use tcpdump command to analysis network messages in Linux/Unix ???

Why tcpdump sometimes drops packets, mangles DNS and shows bad checksums – DaemonForums.

http://perdues.com/doc/ntp.html

http://forums13.itrc.hp.com/service/forums/questionanswer.do?admit=109447627+1287423350088+28353475&threadId=1206847

http://www.fir3net.com/UNIX-/-Linux/General-UNIX/how-to-determine-the-syslog-facility-using-tcpdump.html

http://www.cyberciti.biz/faq/linux-monitor-all-network-traffic-except-ssh-port-22/

http://www.cyberciti.biz/howto/question/man/tcpdump-man-page-with-examples.php

http://www.cyberciti.biz/faq/tcpdump-capture-record-protocols-port/

http://danielmiessler.com/study/tcpdump_recipes/

http://www.cyberciti.biz/faq/linux-unix-verify-keepalived-working-or-not/

http://www.cyberciti.biz/faq/howto-monitor-sniff-apache-http-packets/

http://stupidunixlinuxtricks.blogspot.com/2008/03/snoop-and-tcpdump.html

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