GNS3 is one of a network simulator software that uses GNU / GPL v2, GNS3 is presented in a graphic form that could present a simulation for complex networks. To provide a complete simulation. GNS3 can make you want to learn to obtain and complete the CISCO certification (CCNA, CCNP, CCIP, CCIE, JNCIA, JNCIS, and JNCIE)

GNS3 requires some other software to support, among them:
- Dynamips: core program that allows Cisco IOS emulation.
- Dynagen: a text-based interface for Dynamips.
- Qemu: emulation and virtualization applications that are opensource general.

Here are the results of a review that has been conducted by the authors in designing a simple network, with 3 router (Jakarta, Gorontalo, Makassar) are interconnected, to link the three router with 2 pieces of different networks, I emnggunakan static routing protocol.

Installation Guide

You can perform the installation GNS3 on linux distribution you are using, if it had been available on the repository server, you can directly perform the installation by typing the following command:

Debian-base (Ubuntu, Blankon, Backtrack, etc.):

# Apt-get install GNS3

Redhat-base (Fedora, Centos, etc.):

# Yum install GNS3

If the package is not yet available in the repository GNS3 you, please download the package installer through the following link:

http://biznetnetworks.dl.sourceforge.net/project/gns-3/GNS3/0.7.2/GNS3-0.7.2-src.tar.bz2

If you use a non-Linux operating systems (Windows) you can follow the installation guide on the following link:

http://www.gns3.net/documentation/gns3/quick-start-guide-for-windows-users/

GNS3 you need to use Cisco IOS, the following is a list of IOS versions that are supported by GNS3.
- 1710
- 1720
- 1721
- 1750
- 1751
- 1760
- 2610
- 2621XM
- 2610XM
- 2611
- 2611XM
- 2620
- 2620XM
- 2621
- 3660
- 3725
- 2650XM
- 2651XM
- 2691
- 3620
- 3640
- 3745
- 7200

For a complete guide to the use GNS3, you can access documentation and instructions GNS3 page via the following link;
http://www.gns3.net/documentation/instructions/