August 2007 - Posts
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TTCP (Test TCP, see www.netcordia.com/resources/tools.asp ) gets a large number of hits on our web site. It is a free throughput testing program that has been used for many years. I obtained it from someone at Excelan, a network interface card vendor...
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VoIP troubleshooting is a pretty interesting problem. (See my earlier blog entry regarding my talk at VoiceCon Fall 2007.) There are a large number of tools that look at packets on the wire, or look at the RTCP (Real Time Control Protocol) stream from...
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A lot of people have misconceptions about the CCIE (Cisco Certified Internetwork Expert) program and its numbering. I was consulting at Cisco in 1993 when I first heard about the program and inquired about participating. Brad Wright was the program manager...
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Good network design follows long-established principles like hierarchical design and information hiding. Basic network protocols exhibit this through data encapsulation. Lower layers hide their operation from the upper layers, allowing changes in the...
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I’m doing a presentation at VoiceCon next week in San Francisco's Moscone Center titled Troubleshooting IP Telephony Networks . This presentation will be quite a bit different than other similarly titled talks I’ve seen. I’ll be talking about a number...
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Cisco has implemented a number of features that allow us control over packet prioritization, which allows us to give priority treatment to specific applications. One of these features is the command ip rtp priority starting-rtp-port-number port-number...
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