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Category Archives for "video"

Nov 29

Troubleshooting Slow FTP Uploads

By Kary | case study

Here’s a case study from email subscriber Peter in troubleshooting slow FTP uploads. Scenario: The video team uploads video files via FTP to The Cloud and after a recent firewall replacement, the performance has dropped off by a large amount Now, Peter had already figured out the issue so kudos to him. He even said […]

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Aug 16

Troubleshooting a One-Way Performance Issue

By Kary | case study

Here’s a fun case study on troubleshooting a one-way performance issue. Of course, the root cause for every one-way performance issue won’t be the same as this one, but it’s a bit of experience to add to your bag. It’s very important when analyzing packets to take on the perspective of the host from which you […]

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May 10

How to Do TCP Sequence Number Analysis

By Kary | tutorial

But more importantly, WHY you should do TCP sequence number analysis. Well, you know all those black and red packets in Wireshark? Sure, you’ve seen them, right? Scary, huh? What if someone says there’s a problem and you see a bunch of those packets in Wireshark. Is that the problem? This video will show an example of […]

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Apr 14

Solving Tomcat Throughput Issues on Windows

By Kary | case study

Here’s another real world example of troubleshooting performance problems. An email subscriber, Simon, contacted me about poor Tomcat throughput on Windows 2008R2 – whenever Tomcat served a large file, download speed sucked. To Simon’s credit, he eliminated “the network” by verifying that Apache and IIS did not have the same issue. Here’s where a mediocre network […]

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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 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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