tcpdump

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. How do I monitor my Bind 9 named (or any other dns server) server traffic / network traffic under Linux? How do I find out and view current DNS queries such as A, MX, PTR and so on in real time? How do I find out who is querying my DNS server or specific domain or specific dns client IP address?

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