The tricky part is what do you if you need to figure this out at a later date, or when you are back at your desk with no access to that system. If you are still near the host, and within a timely fashion, you can try command line utilities like netstat –b to determine which application was used. In other scenarios, you might have encrypted packets transmitted to an unknown IP address using TCP port number 3433. However, all analysts will eventually run into a common scenario where they need to identify which application or process transmitted the packets in a trace. In some cases, it will be obvious - for example, HTTP packets with a Mozilla User-Agent request header probably come from a web browser. One of the main features of a protocol analyzer like Wireshark is the ability to decode specific protocols and provide analysis if anomalies are detected. Moreover, analyzing the data is an art in itself it takes a combination of theory, street smarts, and experience. Factors such as SPAN vs TAP vs inline will impact what packets you can capture and timing accuracy. Making a protocol analyzer effective relies on capturing and analyzing packets, but capturing packets isn’t as obvious as you would think. It can do some things that Wireshark can't. This free analyzer is a good complementary tool to have in your toolbox. In this video, I show you how to use a protocol analyzer that you may not be familiar with: Microsoft Message Analyzer. Protocol analyzers like Wireshark are very powerful tools network analysts use for a variety of reasons, including application baselining, identifying the root cause of application or network performance problems, documenting and mitigating cyberattacks, and device configuration tuning.
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