LMTV LIVE | How to Create Scalable Visibility in your Data Center (with Chris Bihary of Garland Technology)



YouTube LIVE event start time: Wednesday, July 19, 2017, 9:30 AM PST


Garland170x200How do you scale your network infrastructure to support multiple monitoring tools - while ensuring 100% packet capture?

This is the problem we have been hearing in the last few years. Data centers (D1 & D2) and enterprise networks have many challenges and two of the big ones are providing the IT department anytime access to full-duplex traffic, while guaranteeing full packet capture. Now layer on top of that a stack of 1G legacy monitoring tools in addition to the migration to 10G/40G and 100G speeds.

Join us for to learn about the latest visibility solution from Garland Technology’s as they introduce and demonstrate their Passive Fiber Modular Chassis System, a flexible, scalable and affordable high density solution for managing up to 24 links in a 1U box at network speeds of 1G/10G/40G/100G.


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Lessons from Sharkfest US 2017 (by Chris Greer)

Sharkfest 2017

Sharkfest turned 10!

Last month, hundreds of Wireshark users, developers, and trainers came together for the 10th annual Sharkfest conference at Carnegie Mellon University in Pittsburgh. Packet-heads from all over the globe could mix and mingle with the likes of Gerald Combs, Laura Chappell, Jasper Bongertz, and Hansang Bae, just to name a few.

For me, Sharkfest is always a highlight of the year. Where else can you ditch the trade-show marketing super-hype and just get down to the wire with the world’s best packet analysts? Network engineers should definitely put this event on their bucket lists, no matter what their experience level with Wireshark and packet analysis.

In recent years, the fine folks who host Sharkfest have approved of having the sessions recorded, making them available on demand. If you have not yet done so, stop by the Sharkfest retrospective page to check out some of the sessions – sharkfest.wireshark.org/sf17

Suggested sessions:

  1. Hansang Bae always does a great job of showing real-world scenarios of how to packet dig. In his session he goes into some case studies of rare packet-level issues that engineers face today. His session video is not yet on the page but I’m sure it soon will be.
  2. Kary Rogers from Packetbomb did a practical session on Understanding Throughput and TCP Windows. Be sure to check that one out – recording available.
  3. Betty DuBois did a very nice session for newbies entitled “Rookie to Vet in 75 minutes”. Although the session recording is not yet available, she did an awesome job on her presentation – definitely check it out!

My notes:

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You Are Here (by Paul W. Smith)

Babylonian World Map w Icon
The late comedian Myron Cohen told the story of a man who hid in the bedroom closet when his paramour’s husband arrived home unexpectedly.  When the husband opens the closet door and asks what he’s doing there, he replies “Everybody gotta be someplace.” 

This existential truth has engaged mankind from the beginning, as have its practical implications.  Hunting and gathering might lead you far and wide, but if you can’t find your way back to the secure confines of your cave, you might lose your place on the food chain.  Locational awareness is one of the most fundamental of evolutionary traits.  Not only does everybody gotta be someplace, but life is just better if you know where that someplace is. 

People have been trying to sort out exactly where they fit into the world for thousands of years.  One of the earliest maps, attributed to the Babylonians, was found on a clay tablet (about the size of a smartphone) that dates to around 600 B.C.  Although it clearly depicts Babylon, the Euphrates River and Assyria, it wasn’t much good for navigation.  Scholars believe the real purpose was more primal – to allow the owner to grasp the world at large along with his own place in it.  Even back then, “You are here” was a thing. 

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Network Troubleshooting Tip - Using Markers to Cut Trace Analysis Time (by Paul Offord)

When we get to the point in an investigation where we are about to break out Wireshark, the complexity of the packet analysis can seem quite daunting. And yet, by covering a few key points, we can dramatically cut the time needed to analyze any diagnostic data.

In my previous post we looked at the importance of a basic understanding of the topology of the system under investigation. In this blog I'll cover the use of markers; a ridiculously simple, but amazingly powerful, concept.  A marker places a distinctive packet in network packet trace data that we can easily find with Wireshark.

The RPR manual contains six pages of information on markers, covering suggested markers and what to use them for.  If you haven't used markers before you are in for a real treat.  Once you get the hang of them, you'll wonder how you ever did without them.

Let's imagine you've been investigating an intermittent slow response time problem for a bunch of users.  Nobody is quite sure what's causing the problem, although the application and platform teams insist it's not them.  You know the drill; if the cause isn't obvious it must be the network, right?

Billions_of_packets

Luckily, a user experienced the problem this morning, and you had packet traces running.  The bad news is that you have 500 GB of trace data (about 5 billion packets) and the user is vague about the time of the problem.

The first strategy ...

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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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