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Packets in Paradise
Tips and Tricks in Protocol Analysis
Packets in Paradise
Posted by Greer, Chris at 1/24/2012 12:06 PM CST
Quick answer? Nada, Zero, Zilch! (Sure there are exceptions – but you wanted a quick answer, right?)

I recall reading a whitepaper one time which gave target average utilization and error levels for Ethernet ports. In the report, it mentioned that a target level for traffic should be 40% on ... Read More »
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Posted by Greer, Chris at 11/21/2011 1:32 PM CST
Close your eyes and think like a packet. You’re leaving the NIC at the client end, and you are on your merry way to the application server at the other end of the connection. What is the first switch and port number you enter into? Which port are you forwarded out of? Which switch is next? Which routers ... Read More »
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Posted by Greer, Chris at 10/28/2011 5:08 AM CDT
When analyzing a packet capture, nothing can be more frustrating than realizing that for whatever reason, packets are missing - not just dropped, but actually missing from the capture buffer. Sometimes, this realization only strikes after spending hours looking through retransmissions, out-of-order, or ... Read More »
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Posted by Greer (3rd party FNET trainer), Chris at 7/20/2011 5:32 PM CDT
Not long ago I was asked to track down heavy bandwidth users by a client. They were experiencing poor performance on their internet connections. Before going after the ISP, they wanted to check to see if some of their bandwidth was being wasted by local users.

At one time or another we've all had ... Read More »
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Posted by Greer (3rd party FNET trainer), Chris at 7/4/2011 1:45 PM CDT
In a nutshell… both! Let’s see why.

Why we need Flow based analysis

Netflow, sFlow, IPFIX are all ways to collect information about traffic that is traversing the network. A flow is a traffic stream with a common ... Read More »
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