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Wireshark use cases3/9/2023 Riding on top of that might be other protocols, such as HTTP for Web pages and POP for email. Go up a layer and you’ll find the Internet Protocol (IP) “talking” between IP addresses. The Ethernet protocol “talks” from one MAC address to another. A higher-level protocol can “ride” atop a lower-level protocol, with each protocol optimized for a specific purpose. 2:To begin capturing packets, select the local Ethernet interface on your computer and hit ‘Start.’Ī communications protocol is simply a way to format data so that both sides of the conversation can understand it. Wireshark lets you examine each of these layers down to the byte level.įig. Each packet is wrapped with headers containing information on the source and destination addresses and the length of the data. A large file is split up, sent in separate packets, then reassembled at the other end. All network data is sent in packets - short, manageable chunks of data. Read the documentation!Ī quick refresher is in order before we get started. Wireshark’s Website ( ) and Wikipedia ( en. ) are your friends and will cover things that I had to omit. My examples were done using Transmission Control Protocol over Internet Protocol (TCP/IP) atop Ethernet while it’s by far the most common, it’s not the only way. The usual disclaimer is on a lighted billboard this time: There is absolutely no way that I can cover even a tiny fraction of Wireshark’s features in a single article. Given that this is one of the most powerful tools ever created for network troubleshooting, it’s past time that I devoted an article to this marvelous “sniffer.” In previous articles, I’ve used the Wireshark network protocol analyzer to create various illustrations. In blue highlight the Web browser performs a ‘GET’ request to a remote server in plain text.
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