Tag Archives: wireshark

Network Link Conditioner – Simulating a BAD Network

Last week, I wrote an article about Building a BAD Network with Dummynet. While the goal of that article was to document a flexible “drop-in” solution that would create performance issues on a given Ethernet segment, this week’s article will … Continue reading

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Building a BAD Network with Dummynet

We typically strive to build networks that are fast, error free and introduce minimal latency. However, there is sometimes a need to build something that doesn’t work well. One use case might be to test real world application performance against … Continue reading

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Using the Wireshark Commenting Feature

Somewhere around version 1.8 a commenting feature was introduced in Wireshark. When used with the pcapng file format, the comments are saved within the capture for later use. This feature can be beneficial in scenarios where you may be working … Continue reading

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Understanding The Value Of The Wireshark Certification

About two and a half years ago, I set out to obtain a new certification. This certification wasn’t only new to me, it was new to everyone.  The name of the certification was the WCNA, or Wireshark Certified Network Analyst. … Continue reading

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HSRP Default Authentication

HSRP is sort of the “default” First Hop Redundancy Protocol (FHRP) in the Cisco world. One thing that I find a bit strange is that, according to the documentation, authentication is enabled by default. If this is truly the case, … Continue reading

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PacketPushers with Wireshark Developer Gerald Combs

Most of my friends know that I’m a huge fan of Wireshark. Most also know that I’m a huge fan of the PacketPushers Podcast. So what better than an episode with Gerald Combs, leader of the Ethereal and Wireshark project? … Continue reading

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Thoughts on the Wireshark Certified Protocol Analyst Program

I have long held the belief that understanding what is going on from the perspective of the wire is a crucial component for many of us.  This ability expedites troubleshooting, aids in design, and helps with our ability to learn … Continue reading

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Wireshark—Display Filter by IP Range

How many times have you been using Wireshark to capture traffic and wanted to narrow down to a range or subnet of IP addresses?  There is an “ip net” capture filter, but nothing similar for a display filter.  Unfortunately, this … Continue reading

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Using Wireshark with an ASA

Packet captures can often give us immediate insight into potential trouble spots on our networks.  One of the biggest issues I find is having to get up from my desk, and possibly get in my car in order to get … Continue reading

Posted in CCIE Security, Certification, Security, Technology | Tagged , , , | 1 Comment