Download Wireshark for Mac to perform network protocol deep inspection and live capture. Wireshark has had 3 updates within the past 6 months. About Wireshark. Wireshark is the world's foremost network protocol analyzer. It lets you see what's happening on your network at a microscopic level. It is the de facto (and often de jure) standard across many industries and educational institutions. Wireshark development thrives thanks to the contributions of networking experts across the globe. Wireshark is the world’s foremost and widely-used network protocol analyzer. It lets you see what’s happening on your network at a microscopic level and is the de facto (and often de jure) standard across many commercial and non-profit enterprises, government agencies, and educational institutions. Jan 01, 2000 Wireshark includes tools to create baseline statistics, which also makes it handy for noticing malicious traffic. Moreover, you can use Wireshark to intercept and analyze encrypted traffic. Browsers have symmetric session keys, and the administrator can load these into Wireshark to un-decrypt and examine traffic.
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Wireshark Labs
'Tell me and I forget. Show me and I remember. Involve me and I understand.'
Chinese proverb
One's understanding of network protocols can often be greatly deepened by 'seeing protocols in action' and by 'playing around with protocols' - observing the sequence of messages exchanges between two protocol entities, delving down into the details of protocol operation, and causing protocols to perform certain actions and then observing these actions and their consequences. This can be done in simulated scenarios or in a 'real' network environment such as the Internet. The Java applets in the textbook Web site take the first approach. In these Wireshark labs, we'll take the latter approach. You'll be running various network applications in different scenarios using a computer on your desk, at home, or in a lab. You'll observe the network protocols in your computer 'in action,' interacting and exchanging messages with protocol entities executing elsewhere in the Internet. Thus, you and your computer will be an integral part of these 'live' labs. You'll observe, and you'll learn, by doing.
The basic tool for observing the messages exchanged between executing protocol entities is called a packet sniffer. As the name suggests, a packet sniffer passively copies ('sniffs') messages being sent from and received by your computer; it will also display the contents of the various protocol fields of these captured messages. For these labs, we'll use the Wireshark packet sniffer. Wireshark is a free/shareware packet sniffer (a follow-on to the earlier Ethereal packet sniffer) that runs on Windows, Linux/Unix, and Mac computers. The Wireshark labs below will allow you to explore many of the Internet most important protocols.
We're making these Wireshark labs freely available to all (faculty, students, readers). They're available in both Word and PDF so you can add, modify, and delete content to suit your needs. They obviously represent a lot of work on our part. In return for use, we only ask the following:
- If you use these labs (e.g., in a class) that you mention their source (after all, we'd like people to use our book!)
- If you post any labs on a www site, that you note that they are adapted from (or perhaps identical to) our labs, and note our copyright of this material.
The version 8.1 Wireshark labs have been significantly modernized and updated in 2021, and come with new Wireshark traces files taken in 2021. Click on the links below to download a Wireshark lab on the given topic.
| Lab topic | 8th ed. | 8th ed. | 7th ed. |
|---|---|---|---|
| Getting Started | 8.1 (Word) | 8.0 (PDF,Word) | 7.0 (PDF,Word) |
| HTTP | 8.1 (Word) | 8.0 (PDF, Word) | 7.0 (PDF, Word) |
| DNS | 8.1 (Word) | 8.0 (PDF, Word) | 7.01(PDF, Word) |
| TCP | 8.1 (Word) | 8.0 (PDF, Word) | 7.0 (PDF, Word) |
| UDP | 8.1 (Word) | 8.0 (PDF, Word) | 7.0 (PDF, Word) |
| IP | 8.1 (Word) | 8.0 (PDF, Word) | 7.0 (PDF, Word) |
| NAT | 8.1 (Word) | 8.0 (PDF, Word) | 7.0 (PDF, Word) |
| DHCP | 8.1 (Word) | 8.0 (PDF, Word) | 7.0 (PDF, Word) |
| ICMP | 8.0 (PDF, Word) | 7.0 (PDF, Word) | |
| Ethernet and ARP | 8.0 (PDF, Word) | 7.0 (PDF, Word) | |
| 802.11 WiFi | 8.0 (PDF, Word) | 7.0 (PDF, Word) | |
| SSL (currently being updated to TLS) | 8.0 (PDF, Word) | 7.0 (PDF, Word) | |
| Trace files(new trace files for 8.1; same trace files for 7, 8.0) | wireshark-traces-8.1.zip | wireshark-traces.zip | wireshark-traces.zip |
These Wireshark labs are copyright 2005-2021, J.F. Kurose, K.W. Ross, All Rights Reserved.
Last update to labs: June 4, 2020
Comments welcome: kurose@cs.umass.edu
Chances are if you're capturing packets and analyzing network traffic, you're using Wireshark – it's the world's leading capture tool, after all.
But how exactly does Wireshark it troubleshoot network issues, and who can benefit most from using it? Well, in this blog you'll find out!
What is Wireshark?
Wireshark is the most well-known, and frequently-used, protocol analyzer. It can be used to capture packets, too. A packet is simply a unit of data, and Wireshark catches them as they pass from your device to the internet.
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Once captured, Wireshark lets you monitor your network at a granular level and in real time. This comes in handy when conducting traffic analysis, which can then be used to troubleshoot problems by locating the root source.
Wireshark can analyze data from the wire, via a live network connection, or analyze data files from packets that have already been captured. It can capture traffic from a variety of media types, too, like Ethernet, LAN, USB, and Bluetooth. What's more, the tool is also capable of reading live data from all sorts of networks: Ethernet, IEEE, 802.11, point-to-point Protocol (PPP) and loopback included. And, as an extra cherry-on-top, a user can trace VoIP calls made over the network when analyzing captured traffic.
That's a lot of information! Fortunately, Wireshark comes loaded with various filters that make it possible to make sense of all this data.
You'll be able to zero in on what interests you and colorize your packet display. Wireshark also allows users to visualize network streams and create statistics.
Wireshark currently supports thousands of protocols. The majority of these are old and unpopular, but TCP, UDP, and ICMP are fully supported, allowing for the analysis of IP packets. Wireshark users can also decide how to dissect protocols and create plug-ins if they're like to dissect a new protocol that's not currently supported.
The uses of Wireshark
The above can all seem rather complicated if you're new to Wireshark or networking. Wireshark is often compared to a flashlight – a handy tool that lets you see what you're doing more clearly, and is pretty indispensable if you're going to be fixing a car at night or exploring a wooded area. With one, you can highlight things, you might've otherwise missed and identify threats.
Primarily, Wireshark is used by administrators to troubleshoot network performance issues. If you notice something awry on your network – like a hike in latency, dropped packets, retransmission issues, or a malicious threat – you can use Wireshark to investigate.
With the analysis provided by Wireshark, you'll be able to inspect issues as they occur to figure out what's causing them. Of course, Wireshark makes this easier by rendering the traffic it captures into a readable format – seeing as we mere humans have trouble reading binary. Thus armed, you can check out your traffic in far greater detail, monitoring the type of traffic and its frequency, quantity, and latency.
If you notice something awry on your network – like a hike in latency, dropped packets, retransmission issues, or a malicious threat – you can use Wireshark to investigate.
As for who uses Wireshark, you might be surprised by how popular it is across all sorts of digital-spheres. Businesses, schools, tech-savvy individuals and even the government make use of the tool. Part of Wireshark's appeal is rooted in the fact that it's a great way to learn more about how network traffic works in the first place, as well as how to solve problems when they crop up.
However, you'll need an existing grasp of networking basics to use Wireshark effectively. This would ideally include knowledge of routing and port forwarding, as well as the three-way TCP handshake, the TCP/IP stack, and a variety of protocols, like TCP, UDP, DHCP, and ICMP.
One more thing...
It's also important to note that Wireshark is not an intrusion detection system (IDS). It's a protocol analyzer, and cannot alert you if someone's up to no good on your network. What it can do, however, is display malformed packets and visualize traffic – making malicious threats easier to inspect and root out.
All in all, Wireshark is adept at creating a baseline. With it, you'll have a far better understanding of what's normal – and what's not – for your network.
Where to get Wireshark
You can download Wireshark directly from its website. It's free, and seeing as it's GPL licensed, it can be shared, used, and modified by anybody. Wireshark is compatible with any Windows, Mac, or Linux device, too.
Gerald Combs started the Wireshark project back in 1998 – though it was known as Ethereal then, and was until 2006 – and it has since flourished thanks to contributions made by experts and volunteers alike. Combs still works on Wireshark's code today, and is involved in rolling out new versions and updates.
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