Currently viewing the category: "GNS3"

How to connect Vyatta to Cisco using VirtualBox and GNS3

By On August 17, 2010 · 5 Comments

“Vyatta is  a software-based, open-source, network operating system that is portable to standard x86 hardware as well as common virtualization and cloud computing platforms. By deploying Vyatta, users benefit from a flexible enterprise-class routing and security feature set capable of scaling from DSL to 20Gbps performance at a fraction of the cost of proprietary solutions.”

Shortly, you take this piece of software, install it on a x86 machine (any decent PC with quality network card will do) and have yourself a network [...]

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How to emulate ASA in Ubuntu 9.10 and GNS3

By On April 28, 2010 · 2 Comments

Brainbump.net has an excellent and very complete how to emulate ASA using just the following components:

Ubuntu 9.10 – 32 bit Edition GNS3 v0.7 RC1 tgz Dynamips 0.2.8-RC2 binary for Linux x86 platforms Qemu-0.11.0 tar.gz Qemu-0.11.0 Patch ASA Binary Version 8.0(2) – (asa802-k8.bin)

How-to is divided in 3 video tutorial parts for easy understanding and start with the most basic installation on GNS3 under Ubuntu 9.10 and continue with the actually configuration on the emulation.
If you are interested in security or [...]

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How to integrate GNS3 with VirtualBox

By On February 9, 2010 · 9 Comments

The best method to test a solution that you want to implement is to real see how it’s performing with some real traffic. GNS3 or Dynamips are very good at emulating a network topology  but unfortunately they cannot assure you with the tools capable to test the environment you just create.

In one of my old posts I showed how to integrate Virtual PC with GNS3, but the problem is that with Virtual PC you can just [...]

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How to integrate GNS3 with Virtual PC

By On March 23, 2009 · 12 Comments

In this article I want to show you how to extend your posibilities to test a network in GNS3. Sure, it’s simple sometime to use a Loobpack interface on one of your edge routers to simulate an external network, but sometime is useful to have something connected to the router port. Take as an example QoS marking and classification. If you want to mark something inbound, then you need a connection to the router port where you want to [...]

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GNS3: How to create Frame-Relay Hub and Spoke lab

By On February 22, 2009 · Leave a Comment

When I first came in touch with GNS3 I had not idea how to work with it. Not because it is so complicate to operate, but because I didn’t saw any software like this one. GNS3 and Dynamips make a very good job together, allowing users to emulate a lot of network scenarios with different topologies. If using only Dynamips suppose that you edit all the configuration file manually in text mode, now with GNS3 you can drag and drop devices, connections and configure them [...]

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GNS3: How-to save multiple topology configurations for good

By On December 19, 2008 · 4 Comments

GNS3 is an extremely useful tool if you are using Dynamips to emulate Cisco devices. It is a graphical environment in which even a newbie can do complex configuration by clicking and dragging routers, switches, connections into a topology that can be saved.

The problem that occurred to me in the past (and maybe to you also) is the following. Let’s assume that we create a configuration with routers named R0 and R1 and you save the topology config and also the routers config (“copy [...]

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