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Translating:20140915 Linux FAQs with Answers--How to capture TCP SYN, ACK and FIN packets with tcpdump.md
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Linux FAQs with Answers--How to capture TCP SYN, ACK and FIN packets with tcpdump Linux FAQs with Answers--How to capture TCP SYN, ACK and FIN packets with tcpdump
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> **Question**: I want to monitor TCP connection dynamics (e.g., three-way handshake for connection establishment, and four-way handshake for connection tear-down). For that, I need to capture only TCP control packets such as those with SYN, ACK or FIN flag set. How can I use tcpdump to capture TCP SYN, ACK, and/or FYN packets only? > **Question**: I want to monitor TCP connection dynamics (e.g., three-way handshake for connection establishment, and four-way handshake for connection tear-down). For that, I need to capture only TCP control packets such as those with SYN, ACK or FIN flag set. How can I use tcpdump to capture TCP SYN, ACK, and/or FYN packets only?