429 posts categorized "Test & Measurement" Feed

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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Tonys bits – Simple IP Config (by Tony Fortunato)

I have been getting a lot of requests to share the software that I use in my classes and in the field, so here we go.

This one is called Simple IP Config. Pretty straightforward software where you create different network profiles that you would need in your environment.  For example you might need a static IP address to configure equipment for the first time.  Or you might need a static IP address for certain networks.

The software is free, has no ads, portable, so nothing to install and lastly, it just plain works well. You can find it here; https://sourceforge.net/projects/simpleipconfig/

Depending on your configuration, you may need to run the software as an administrator and leverage the fact that it uses plain text ini files to further customize.

 



Enjoy

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Saving Specific Packets With Wireshark (by Tony Fortunato)

I’ve received a few requests to update some of the Wireshark basic skill videos since the user interface has changed in version 2.

I just got an email from a new Wireshark user asking how to save packets that result from a display filter.

In this video I cover that procedure and look forward to creating more updated videos

 

 

 

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Introduction to Automating Your Testing (by Tony Fortunato)

The ability test consistently is a critical factor when troubleshooting, baselining or lab testing. This becomes a bigger issue when you are part of a team and need to replicate a test that your colleague performed weeks or months ago.

In inability to perform the same test, with the same steps can lead you to make incorrect conclusions and cause general confusion.

The tried and true way to document your testing methodology would be to write or type out your steps. Heck you might include the odd screenshot or video to ensure the reader follows your steps exactly.

This is where I add a little something extra and suggest automating your tasks with some sort of scripting language so you literally just press a button, sit back and collect the data.  Scripting ensures that every step is performed the same way, with the same delays, etc. every time.

The most basic script in the Microsoft world would be a batch file. I’ve been tinkering with batch files since 1990 and am always impressed how Microsoft has added more functionality, added Powershell and other goodies over the years.  Of course our Linux friends have bash scripts which server the same purpose.

If batch files aren’t your cup of tea there are tons of scripting packages and languages out there. One of my favorites out there is Autoit (https://www.autoitscript.com/site/autoit/) since it s afree Basic like scripting language. Autoit now has a portable version and you can compile your scripts to stand-alone executables.

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Knowing Your Tools (by Tony Fortunato)

Knowing Your Tools

I was troubleshooting and had a continuous ping running against a router. I then connected a network analysis tool and suddenly my ping times went from <1ms to well over 100ms. You got to love it when you have to stop troubleshooting the network issue to troubleshoot your tools ;).

I had the presence of mind to immediately unplug the tool and immediately noticed that the ping times returned to ‘normal’. I connected the tool and the times shot right back up. Hmm.  Now I’m intrigued.

Initial Pings After Pings

First thing was to ensure the tool’s settings were set for defaults or factory settings and they were. 

The next thing I did was capture my station’s traffic to ensure I wasn’t interacting or communicating with the tool that would cause some latency because my computer was ‘busy’. 

I could see the ping (ICMP) response times where initially less than 1 ms.

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