376 posts categorized "Tony Fortunato" Feed

Wireshark Dropped Packet Counter (by Tony Fortunato)

I'm keeping this one nice and short.  shorter than my regular short posts  ;)

For those of you who read my material regularly, I’m sure you will remember me referring to ‘baselines’ and ‘tool calibration’ exercises. 

The point is for you to take a closer look at your tools or applications and understand how they behave and in some cases what changes version changes may bring.

In this specific example I was working with Wireshark and noticed the ‘dropped’ packet counter is missing from the status bar and found it elsewhere.

 

 

 

 

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Troubleshooting SMB Connection Issue Using Wireshark (by Tony Fortunato)

In this video I walk you through how i worked my way through a Microsoft connectivity problem using Wireshark.

The main point of the video is to pay attention to the methodology where i document the issue, apply a change and re-measure.

Just some text from the slides;

"The problem is with a device running Windows 7 that is configured with some shares to its local drives like a storage server.Every so often no one can connect to the shares, Android users just see a spinning/processing icon and windows users get a variety of connection error messages. The end result is always the same, no connection.

The only solution is to reboot the Windows 7 device and things have gotten so bad that now they have a scheduled script that reboots the computer daily.I asked them to capture some packets from their computer when it happens again.

By noon I had a capture."

 

 

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How To Rename Your Network Interfaces In Windows (by Tony Fortunato)

From ipconfig to Wireshark, there are many situations where you find yourself referencing your network interfaces. I find it annoying and confusing when I see many Ethernet Adapter’s or Local Area Adapters listed on my screen.

This can be a major issue if you are not physically close to a computer that you have set up as a remote probe or capture agent. Some people I spoke to about fixing this issue reply that they don’t know anything about hacking the registry and worry that it may break something on their computer.

In this video I show you how to quickly and easily fix this issue so there is just one less thing to make your job difficult.

https://www.youtube.com/watch?v=N7fIrKKYx4g

 

 

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Wireshark’s new tool – Transum (by Tony Fortunato)

I’ve been playing around with TRASUM for a year or so and got excited when it was announced that it is now included with the current Wireshark build. No more downloading, putting the files in the correct folder, etc..

Transum is a pretty helpful addon since it provides protocol various statistics in your trace file.

In the video below I provide a quick rundown of how to enable it, configure and use it. Once you get playing with it, you will see its immediate benefit.

Here’s the two links I reference in the video to make life a bit easier for you.

Transum Tribelab link:

https://community.tribelab.com/course/view.php?id=9

Sharkfest presentation:

https://sharkfest.wireshark.org/assets/presentations15/33.pdf

 

 

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Wireshark Decode As Feature (By Tony Fortunato)

Wireshark does a great job Identifying, Decoding, Dissecting and presenting packets and their associated packets.

Every so often you may find that Wireshark doesn’t figure out the protocol and leaves you with a bunch of TCP or UDP packets.

In this video I show how to quickly teach Wireshark what the protocol should be.

Even if you don’t know the protocol, you might be able to look in the Bytes pane to figure out what it should be.

Enjoy.



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How to Reset a Cisco 3750 To Default Factory Settings (by Tony Fortunato)

As a consultant/contractor I usually run into the following scenario where I’m given equipment to configure and it currently has a password. Even though I know the answer, I still ask if they know the password. After several tries of what it should be, I give up and ask if I can reset the device to default and start from scratch.

Over the years I have gone through the process countless times with as many vendors. Some procedures are as simple as holding a reset button and others are complicated that involve calling the vendor for a challenge/response.

Cisco has variations on their reset procedure but mainly consistent which makes it fairly easy. In this video I will show you how to rest a Cisco 3750 switch to factory settings.

 

 

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