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All Posts by Kary

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About the Author

I like being the hero. Being able to drop a bucket of root cause analysis on a burning network problem has made me a hero (to some people) and it feels real good, y’all. Get good at packet analysis and be the hero too. I also like french fries.

Aug 03

Case Study: All Web Pages Load Slooooowly

By Kary | case study

So far I’ve mostly shown you concepts and techniques to analyze performance. Well, now I’m gonna solve a real world problem with packet analysis and walk you through it how I did it. Brandon joined the PacketBomb email list and we were email chatting about packet analysis. He mentioned a problem he was trying to […]

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Jul 30

How to Troubleshoot Throughput and TCP Windows

By Kary | tutorial

Make sure you’ve read Understanding Throughput and TCP Windows before watching this video. I mean, you don’t HAVE to, but I recommend it. No one’s ever asked you why the network is slow, right? Hahahahahaaaaaaa haa ha. Ha. Oh man. What a funny joke. The better question is can you think of a day in which […]

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Jul 30

Understanding Throughput and TCP Windows

By Kary | text

Throughput is generally measured in the amount of data sent over time e.g. bits or bytes per second. Sending more bits in a shorter amount of time equals higher throughput. So let’s talk about some of the factors that control how much data can be sent in a given time period. Here’s some data represented […]

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Jul 16

Why Should You Learn Packet Analysis?

By Kary | text

(I’ll explain this picture later.) This whole thing started when I posted Why don’t more people know how to do packet analysis? on reddit. Up to that point, I thought maybe it was just me and a few others who valued and dug packet analysis since I hadn’t met many people who could do it […]

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Jul 07

How to Prove It’s Not the Network

By Kary | tutorial

Or prove that it is the network. If you’re a network engineer, how much time do you spend defending the network? Everyone points a finger at the network; it’s guilty until proven innocent. Everything looks good from your standpoint: monitoring, alerts, maybe some pings, download a file from a server…it all seems to check out. […]

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May 25

How to Hack a Cisco Router ACL

By Kary | tutorial

In this video you will learn: How to connect to a server protected by a Cisco router ACL How to manipulate TCP flags of packets sent and received by your computer How I’m not a l33t h4x0r Ok, let’s go! Leave a comment: Do tell me what you liked and understood Do tell me what […]

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