The most recent content from our members.
This Thursday, March 26th, at 10:00 a.m. CDT, we're hosting a new webcast on "Network Troubleshooting - the Top 5 Technologies to Leverage". This webcast is going to be a little different than some of the others as we're going to dive a little deeper into how each technology works vs. focusing on applications the leverage…
In my last post I talked through some of the reasons why mastering tcpdump is useful. Building on our previous example in this post I’ll focus on using TCP flags for troubleshooting. Even with our cleaned up filter, we can still see quite a lot of traffic that we don’t care about. When troubleshooting connectivity issues,…
Well hello there, returning like a bad penny, I am here to talk again about Deep Packet Analysis. In my last series of blogs I talked about the use-cases for Deep Packet Analysis but conspicuous by it’s absence was a lack of real world applications. This time I thought I would dust off my old-timey packet analysis skills…
Deep packet inspection (DPI) is a technology used to capture network packets as they pass through routers and other network devices, and perform packet filtering to examine the data and find deeper information about the data carried by the packets. Unlike stateful packet inspection (SPI aka shallow packet inspection) which…
It struck me this morning that one of the few constants in life is the importance of fundamentals. I can well remember my junior high and high school basketball coach drilling the importance of fundamental basketball into our young heads - dribbling, proper shooting technique, passing - he was all about mastering the…
In my last post I looked at how flags can pull useful information out of packet that we otherwise we might struggle to see. This time, we’re going to use tcpdump to look into the actual applications. The first application I'm going to look at is the humble Domain Name Service (DNS), the thing that needs to work flawlessly…
I'm purposely put a .txt extension on these files for upload, and have not included any executables... the executable being a compiled form of the perl script, that runs independently of requirements to run perl. I just don't know if executables are allowed here. I am going to include an archive…
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