Step one: the client asks, “Hey server, do you have port 80 open? I want to synchronize (SYN). Transmission Control Protocol (TCP) is the most pervasive protocol on the Internet, and it starts with a three-way handshake. Now I can just go to Analyze | Expert Info | Notes, and they will be listed for me. This is something I used to have to hunt for with filters. I am one of those people who actually reads the release notes, so I was very excited to see that Wireshark 1.10.1 now flags a retransmitted TCP synchronize (SYN) packet with an Expert Info Message. Also, new features sometimes slip into a “dot” revision. A major release goes out at least twice annually, with multiple “dot” releases, a.k.a.
One thing that makes Wireshark the world’s most popular protocol analyzer is how often the open-source tool is updated.
Answer? When it is flagged as a retransmission in Wireshark!
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