382 posts categorized "Tony Fortunato" Feed

Wireshark Fundamentals (by Tony Fortunato)

I am noticing that i am  seeing a lot of people who are self taught when it comes to Wireshark and protocol analysis as well as those who want to get into it.

I decided to create a 2 hour Udemy (Wireshark Fundamentals) course to teach people Wireshark basics and in the last lecture Idemonstrate how to get started with protocol analysis.

The key is to demonstrate why and when to use a feature. Knowing where the features are doesn't imply you know when and why to use them.

I encourage anyone interested in protocol analysis to get familiar with cause and effect. That is where you simply do something and review those packets.

Last month had a draw for free coupons to take my class and thought it would be cool to post an entire lecture from the course.  Enjoy.




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Wireshark Udemy Free Course Giveaway (by Tony Fortunato)

I have been presenting, training, creating videos, articles and sharing information for over 20 years. As technology evolves, I have tried to keep up by creating lovemytool google and linkedin groups as well as contributing to many social media technical groups/online publications.

When youtube started becoming a source of information for technicians, i created a channel. My youtube channel has over 330 videos covering various topics such as Microsoft operating system, Cisco, Wireless, Wireshark and other technical topics.

I will not be teaching or presenting this year (so far) so i thought i would take some of the suggestions sent to me last year. I had several requests to create some online material so I created a "Wireshark 2 Fundamentals" class on Udemy as my first attempt. This is introductory class for those who want to start using Wireshark or if you need a refresher.

No need to be intimidated by Wireshark! Many IT analysts avoid getting into Wireshark because it seems overwhelming.  You don't need a lot of experience to get up and running with Wireshark. In this course you will learn all the basics required to confidently capture, save and navigate around Wireshark's environment. I will spend some time explaining enough of the software to encourage you to use it more.

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Figuring Out Where To Slice a Packet Using Wireshark (by Tony Fortunato)

There are many scenarios with packet slicing is helpful and possible necessary.  I covered this in a previous article Network Protocol Analysis Tip: Packet Slicing (http://tinyurl.com/yb38lw9j).

To summarize, here are some examples or scenarios where you should consider packet slicing:

  • The data is not useful or unreadable/encrypted
  • To conserve disk space or reduce your trace file size
  • Legal issues around the payload of captured packets
  • Reduce load on your capture device. Some packet capture tools are less likely to drop packets when packets are sliced.

David K, one of my YouTube subscribers, asked a great question, “… How could one do that? …”. I thought what a great question since there are times when I assume the reader knows how to do this.

In this video I cover how to figure out the packet slicing value for a HTTP GET command and the destination MAC address.  From these two examples, the reader should be able to calculate any other packet slice value.

Please keep in mind that you should always go through this process to determine the packet slice value or offset. This offset may change depending on the network or application so don’t assume the packet slice value will remain the same.



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Wireshark Capture Interface Issue (by Tony Fortunato)

When I first started my website I had a whole section on product ‘issues’ or ‘bugs’.

My intent was to help my clients, subscribers, while reducing the number of emails I get about these issues.  Over the years, I found it to be too much work to maintain since I introduced more tools to my website.

In the past 2 years, I have eliminated almost all vendor specific tool webpages from my site that contained tips, tricks and bugs.

Wireshark is still one of the primary tools I use in the field and still do private training or presentations with it, so I thought I would keep that section on my website.

In this video I explain an issue I ran into recently with the default capture interface setting. The purpose of the video is to document the issue and help anyone who may encounter this issue.

Let me know if you find this helpful and I will create more along with my usual tips and tricks.




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Capture Packets With Microsoft’s netsh (by Tony Fortunato)

There are many challenges we face when I want to capture packets while troubleshooting.  

  • Installing a packet capture tool such as Microsoft’s Netmon or Wireshark, might be a deal breaker for some admins.
  • Using a span or mirror port might not be available or add excessive latency to packets.

In most cases I would be happy with a solution that simply captures the packets and I can analyze the data on another system.

Many analysts I speak to are not aware that most Microsoft operating systems allow you to capture packets without installing anything on it.  The command is netsh trace start etc… 

In this video I show you how to get started by capturing data and making the trace compatible for Wireshark.



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Wireshark Decode As Example (by Tony Fortunato)


There are many scenarios when you work on a trace file and your protocol analyzer doesn’t decode the application. I see this a lot with proprietary applications, some IOT devices and when administrators change the application default port number. In less common scenarios, you might be trying to figure out how malware or worms spread in your network or try to determine an application signature.

In this example I show you how to use Wireshark’s Decode As feature to teach Wireshark how to decide a trace as FTP.

I run through some navigation tips and tricks, how to resize the columns, how to see the data within the packets (when it is in clear text and lastly how to use the Decode As feature.

Every protocol analyzer may have different term for this feature, but you should know how to do this in your favorite analyzer.


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