![]() You are checking to see that the fetch works and retrieves some content. This will fetch the resource and either write it to a file (wget) or to the screen (curl). Pick a URL and fetch it with wget or curl.A simple Web fetch of a URL from a server of your choice to your computer, which is the client, will serve as traffic. We want this trace to look at the protocol structure of packets. Proceed as follows to capture a trace of network traffic alternatively, you may use a supplied trace. Both have many options (try “wget –help” or “curl –help” to see) but a URL can be fetched simply with “wget URL” or “curl URL ”. Under Mac, curl comes installed with the OS. Under Windows, wget is available as a binary look for download information on. Under Linux, wget can be installed via your package manager. Unlike a web browser, which fetches and executes entire pages, wget and curl give you control over exactly which URLs you fetch and when you fetch them. wget and curl are command-line programs that let you fetch a URL. Wget / curl: This lab uses wget (Linux and Windows) and curl (Mac) to fetch web resources. We highly recommend that you watch the short, 5-minute video “Introduction to Wireshark” that is on the site. You can download it from if it is not already installed on your computer. Wireshark is widely used to troubleshoot networks. ![]() It colour-codes packets by their type and has various ways to filter and analyze packets to let you investigate the behaviour of network protocols. It provides a graphical UI that shows the sequence of packets and the meaning of the bits when interpreted as protocol headers and data. Wireshark runs on most operating systems, including Windows, Mac and Linux. ![]() The packet trace records a timestamp for each packet, along with the bits that make up the packet, from the lower-layer headers to the higher-layer contents. A packet trace is a record of traffic at a location on the network as if a snapshot was taken of all the bits that passed across a particular wire. Wireshark: This lab uses the Wireshark software tool to capture and examine a packet trace. Lab Exercise – Protocol Layers Objective To learn how protocols and layering are represented in packets. ![]()
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