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September 10, 2012, 2:25 PM PDT Takeaway: Add these apps to your portable toolkit for network troubleshooting, monitoring, and management. Having all your tools in one place certainly makes your job easier. This is especially true when you need networking tools.
September 5, 2012, 6:00 AM PDT Takeaway: Scott Reeves explains how to use jperf to simulate a TCP or UDP connection and then use Wireshark to analyze the traffic in order to help pinpoint network issues. In a previous post on jperf , I wrote about using jperf to check network performance.
When an application fails to perform as expected, the network is often the first thing blamed. I suppose this is because end users typically view the network as the sole limiting factor with regard to throughput, unaware of the intricacies of application, database, and storage performance. For some reason, the burden of proof always seems to fall onto networkers to demonstrate that the network is not at fault before troubleshooting can begin elsewhere.
<img width="400" height="250" src="http://danielmiessler.com/images/tcp_header.gif" alt="tcp_header"/> Image from securitywizardry.com tcpdump is the premier network analysis tool for information security professionals. Having a solid grasp of this Ã¼ber-powerful application is mandatory for anyone desiring a thorough understanding of TCP/IP . Many prefer to use higher level analysis tools such as Ethereal Wireshark , but I believe this to usually be a mistake.
This article discusses the new features and functionality that are available in PortQry Command Line Port Scanner version 2.0. PortQry version 1.22 is a TCP/IP connectivity testing utility that is included with the Microsoft Windows Server 2003 Support Tools. Microsoft has released a new version of PortQryV2.exe. This new version includes all the features and functionality of the earlier version and has new features and functionality. Note PortQry Command Line Port Scanner version 2.0 is no longer available to download. This article only introduces the features and functionality of it in case you have already downloaded it.