How to Configure Dynagen and GNS3
When studying for the many of the Cisco certifications it is best to get some amount of hands-on experience.
For many students this may be possible by simply doing their normal day-to-day jobs but for many more this opportunity is not possible. In order to fill this void there are really three main solutions: buy or rent Cisco equipment to interact with directly, purchase a Cisco simulator or run one of the dynamips emulation solutions.
While buying the equipment will get you hands-on experience, it does require a decent amount of upfront investment and may not be required if your interests are simply to understand basic Cisco configuration and technology.
There are many good simulation solutions out there (including one I worked on from Cisco Press), but the problem with some of these solutions is flexibility. Many of these simulations do quite well to simulate the environment but they are only programmed to understand the commands required in their simulations and thus don’t scale well outside of this specific set of labs.
Dynamips Emulation SolutionsDynamips is a solution which emulates specific Cisco hardware; this is then used in concert with a real Cisco IOS image. These emulations do seem to be the best of the available solutions but there is a catch — technically the use of an IOS image not on a licensed Cisco device is a breach of the license (as far as I have been told). Although to my knowledge, Cisco has not gone after anyone, it should be noted. The IOS image must also be obtained through a source other than those distributing the dynamips solutions as they can’t provide this image.
Learn the Basics of Dynagen and GNS3At this time the two available dynamips solutions are Dynagen and GNS3.
Dynagen utilizes a text based configuration file which is used to specify the specific parameters to be used. These parameters include the IOS image location, number and name of the routers used, the specific interfaces emulated on each router, and the specific connection configuration between the routers.
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