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In the Virtual Voice lab series, I am using an Ubuntu Linux environment.  To eliminate permissions issues, it is best that you run GNS3 as root.

Here are a couple issues I have experienced when running GNS3 as a normal user.

Not able to start dynamips.
Error msg: Can’t Connect to the hypervisor on port 7200

Not able to connect to a cloud object.
Error Msg: 206-unable to create Linux raw ethernet NIO
Error Msg: 206-unable to create Linux generic ethernet NIO
Error Msg: 206-unable to create UDP NIO

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Most of us have used voice translations rules for digit manipulation to modify both ANI and DNIS. Did you know that you can also block calls based on ANI?

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Is it possible to build a voice lab without actual hardware? The answer is yes and no. You can build a very good lab using GNS3 and VMWare but it is not possible to build a complete lab. The underlying emulation engine for GNS3 (dynamips) does not support digital signal processors (dsps) or voice cards.

Over the next few months, I will show you how to build a very good lab without any hardware. If you want a more complete lab, you will need to obtain at least one router with dsps and voice cards. I have a 2611XM router with DSPs, a vic-2fxs card, a vic-2fxo card and an ATA-186.

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This is part two of my gns3 switching tutorial series. In part 1, you learned how to use a 16 port network module (NM-16ESW) to simulate many features of a Cisco switch. In this tutorial, you will learn how to configure vlans on the switch and how to route between vlans with a ‘router on a stick’ configuration.

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In this tutorial, you will learn how to build a Cisco switching lab … even though GNS3 cannot emulate a Cisco switch. I will show you how to use an NM-16ESW network module in a 3640 router to emulate a switching environment.

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If you have used GNS3 for any amount of time at all, you have encountered this situation. It’s late and you have been working on your lastest lab for hours. You decide to save your work. Logically, you go to File > Save. Unfortunately, the topology is saved but the router configs are gone.

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Since I discovered Dynamips and Pemu, I have been trying to figure out a way to test Pix configurations with a single PC running Windows XP. The real trick has always been communicating with the virtual Pix. With Linux, it was not a problem but Windows has always been another story until I recently figured out how to communicate with pemu using GNS3.

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One of the major hurdles many people face with GNS3/Dynagen/Dynamips is that the emulators do not come with the Cisco Images to actually build a lab. It seems like once a week, I get an email with a request for an IOS Image, Pix Image, Pix Serial Numbers or Pix Activation codes. Just so I make myself clear, I will not give this information to you. Period. However…

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In this tutorial, you will learn how to connect an MS Loopback interface on your PC to the PEMU Pix emulator using GNS3. The trick is to use a switch between the cloud and the virtual PIX.

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In this tutorial, you will learn how to build a small frame-relay lab. I will walk you through adding the routers, the frame switch, configuring the PVCs on the switch, and configuring the routers for basic point-to-point connectivity.

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