Author Archives: RedNectar Chris Welsh

About RedNectar Chris Welsh

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

HOW TO install GNS3 v1.0 beta on Ubuntu/Linux Mint/Debian

I wrote a script to keep my Linux Mint 17.0 GNS3 v1.0 beta install updated. This script has been tested on 32 bit Linux Mint 17 and 32 bit Ubuntu 14.04, and is an updated version of my earlier alpha … Continue reading

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Posted in GNS3 | Tagged , , | 2 Comments

WordPress Changed their editor – and it sucks

Welcome to the keyhole. Trying to edit/create a blog post using WordPress just got harder (as if it wasn’t hard enough already!) When I go to create a page, the first thing you notice is that you have to edit … Continue reading

Posted in rant, wordpress | Tagged , | Leave a comment

VPCS Tutorial-updated

Many people are not aware of how to make the best use of the features the the Virtual PC Simulators (VPCS) application, so I thought I’d run a tutorial. This is re-work of the original tutorial I wrote, updated for … Continue reading

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

GNS3 WorkBench v8.7 is ready for download

It has taken a while, but I’ve finally got all the files for GNS3 WorkBench v8.7 uploaded to sourceforge. And the Windows version (and OS X version) is better than ever. You can now enjoy all the exercises and labs … Continue reading

Posted in Cisco, dynamips, GNS3, GNS3 WorkBench, Labs, Router Configuration | Tagged , , , , , , , , | 6 Comments

ICND1 Readiness Test

Recently I had a student (let’s call him David) ask me “Do you think I am ready to sit the ICND1 exam?” Although David had studied the ICND1 text book, his skills were lacking when it came to configuring routers.  … Continue reading

Posted in Cisco, dynamips, GNS3, GNS3 WorkBench | Tagged , , , , , , , , , , , , | 7 Comments

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

Posted in GNS3 WorkBench | 1 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 , , , , , , | 3 Comments