tons of stuff at www.thetechfirm.com Logs are a vital piece to the troubleshooting or monitoring methodology. I’m sure everyone has looked at a log at some point in their career for one reason or another. One of the benefits in writing the odd piece of network automation code is that you learn about some pretty cool commands. In this case a team was making changes to several pieces of equipment at various times throughout our change window. . read the full article for free at https://www.lovemytool.com/blog/tony-fortunato/ when its published ... https://www.youtube.com/watch?v=G2YfpCQHwDI

Here's me chatting about this article with the guys at LMTV http://www.lovemytool.com/blog/2015/09/network-troubleshooting-latency-vs-retransmission-with-tony-fortunato.html When troubleshooting performance issues most analysts find themselves chasing one of two issues; latency or retransmissions. Both scenarios result in performance degradation but have different root causes and solutions. In this video I cover how the same problem can look like a latency or a retransmission related issue simply by changing your location in the network. I’ve been involved in many troubleshooting exercises where I get a totally different perspective by changing my test point. Here are some additional tips when trying to identify if the issue is latency or retransmission related: • Try to monitor from the senders perspective. If the sender is not physically close, then make yourself the sender by uploading a file or running iperf. • Pay attention to your protocols. This article and video is helpful when dealing with TCP base protocols. UDP is a totally different animal. • Try to leverage operating system commands like netstat –s to identify retransmissions. • Understand what your tools are reporting. For example Wireshark might note a Retransmission, Spurious Retransmission, Fast Retransmission as well as other notes. • Look for TCP specific hints like Selective Right Edge (SRE) or Selective Left Edge (SLE) to possibly indicate packet loss. There is no guaranteed tip or trick when troubleshooting packet loss or latency issues but I hope this article and video will help you when troubleshooting. ... https://www.youtube.com/watch?v=5ztqPYB4iPs

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When I teach or present, I typically get a question asking how I became proficient in protocol analysis and troubleshooting. I explain that I think it boils down to two main categories; experience and practice. It’s interesting how closely related the two are. For example with experience, I can determine what areas I need to get more practice on. And with more practice, I get more comfortable troubleshooting and feel I can design or install equipment more efficiently. Practice doesn’t need to be a formal 1 week class or even a 1 day exercise. When I think of practicing, all I need is my tool of choice and an opportunity to use it. Wireshark is a great example of a tool than can take years to get comfortable with and use effectively. In this example I was playing with a LIVE CD of KALI linux distribution (https://livecdlist.com/kali-linux/) and more specifically the nmap command. I wondered what nmap did ‘on the wire’. So I simply started a ............. Read the full article at http://www.lovemytool.com/blog/tony-fortunato/ when its posted ... https://www.youtube.com/watch?v=HscWfWFUmM0