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traffic information

Q. How do I capture specific protocol or port such as 80 ( http ) using TCPDump tool under Linux / UNIX? How do I recording Traffic with TCPDump and find problems later on?
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Q. I'm running application called Urchin or Google Analytics under FreeBSD and I'm getting the error that read as follows:
ERROR: (8011-323-1057) Failed to allocate memory

How do I fix this error?
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