Author Archives: RedNectar Chris Welsh

About RedNectar Chris Welsh

Professional IT Instructor. All things TCP/IP, Cisco or VoIP

How to find the zero subnet and broadcast address of a given IP address

I’ve just received an email asking for help. Would you please clarify this concept for me on how to find the zero subnet and broadcast address of a given IP address. For Example: The given IP address was 200.1.2.0/28 My … Continue reading

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Posted in GNS3 WorkBench | Leave a comment

Building a new GNS3 WorkBench lab

Building a new GNS3 WorkBench lab [Note: The procedures described in this post are dependant on the reader having a copy of GNS3 WorkBench Virtual Machine v8.7 or later] GNS3 WorkBench comes with lots of labs, but building a new … Continue reading

Posted in Cisco, dynamips, GNS3, GNS3 WorkBench | Tagged , , , , , , | Leave a comment

Cisco UCS has had a baby (Mother and Daughterboard doing well)

Originally posted on UCSguru.com:
As many of you know I am now in full CCIE Datacenter study mode, and as such have not had as much time to blog and answer posted questions as I would like. However I…

Posted in GNS3 WorkBench | Leave a comment

Why configuring NTP demands patience

I noticed that my router’s clock was about half an hour off, so I decided to configure NTP. However, it proved much more frustrating that I though, due mainly to my impatience. In this article I hope to explain to … Continue reading

Posted in CCIE, Cisco, NTP | Tagged , , , | Leave a comment

Q&A on GNS3 WorkBench v8.6

I got some great questions from Rob Methven so I thought I’d answer them here in the form of a “Q&A”. Q. I got the Etherswitches and VPCs pinging each other no problem. However, when I do a show mac-address … Continue reading

Posted in dynamips, GNS3, GNS3 WorkBench | Tagged , , , , , | 11 Comments

GNS3 WorkBench v8.6 is finally out

Executive Overview The next version of GNS3 WorkBench is out.  You can download it several forms: An entire Virtual Machine as a single blob (although split into two files 2.5G-3G in size) The same Virtual Machine as individual files (in case … Continue reading

Posted in CCNA, Certifications, Cisco, dynamips, GNS3, GNS3 WorkBench, ICND1, ICND2, Labs, Mac OS X, Microsoft, Routing, Wireshark | Tagged , | 7 Comments

Using an iPad to improve Webex presentations – especially the Whiteboard

I had to do some Webex presentations recently – and I found the Webex interface clunky and dated – especially the annotation functions and the Whiteboard function.  Here is how I managed to at least spruce up the Whiteboard function … Continue reading

Posted in Webex | Tagged , , , , , , , , , , , | 4 Comments

What is 100Base-Tx and 1000Base-TX

I came across a question in the Cisco Learning Network which highlighted a source of confusion that many people have. Call me pedantic, but I thought I’d set the record straight – and let you know that when people refer … Continue reading

Posted in 1000BASE-T, 1000BASE-TX, 100BASE-T, 100BASE-TX, 802.3, Ethernet, IEEE | 3 Comments

Big Data Defined

OK – I stole it. But it was too good not to share: Big data defined: Big data is like teenage sex: Everybody talks about it Nobody really knows how to do it Everyone thinks everybody else is doing it.. … Continue reading

Posted in big data, blog

FCoE versus FC Farce

Originally posted on The Data Center Overlords:
Updates 2/6/2014: @JohnKohler noticed that the UCS Manager screenshot used (see below) is from a UCS Emulator, not any system they used for testing. Evaluator Group promises answers to questions that both I…

Posted in Cisco, Data Center, Data Centre, UCS