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I just found out about a great tutorial on designing logging solutions by Marcus Ranum. Marcus has been doing network security work for a long time and is well known in the network security industry. I have previously referenced some of his work in my...
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've always looked at percentage of interface errors as an indicator of which interfaces I should examine. What did I know? Not enough, as it turns out. I've been working with customers on application performance, as you might have guessed from...
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In the last two blogs, I described how application performance is impacted by TCP Retransmissions. Of course, there are many other causes of poor application performance. My review of this topic came about because Pete Welcher and I have just finished...
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In my last post, I talked about TCP retransmissions that are caused by link errors. Another source of TCP retransmissions is too much buffering in network routers and L3 switches. Some buffering allows the network to handle traffic bursts without dropping...
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I've been doing a number of network assessments recently and one of the factors that I use to determine network health is the number of TCP retransmissions that occur. I look at servers and user workstations as well as looking for retransmisisons...
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This is the fourth and final post of a series on the network management architecture used by NetCraftsmen . The architecture is shown below, consisting of seven elements. In this post, we'll look at Topology Mapping and discuss integrating the elements...
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This is the third of a series of posts on the network management architecture used by NetCraftsmen in our network assessments. The architecture consists of seven elements, shown below. The two prior posts covered Events, NCCM, Performance, and IP Address...
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In Part 1, I discussed a Network Management Architecture, composed of seven elements, shown in the figure below. I described the Event and NCCM elements in that post. Performance Performance monitoring is typically where most people focus their early...
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At Netcraftsmen , we get to do a lot of network assessments where we examine and evaluate a customer's network, including the network management implementation. As a result of this work, we've identified a set of network management architectural...
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One of the new features in the latest release of NetMRI is the ability to write scripts in Perl. This means that the Perl programmers in your organization can now help you write and debug your command scripts. But the environment in which you can develop...
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