GNS3 | Graphical Network Simulator for Cisco CCNA, CCNP, CCIP and CCIE as well as Juniper JNCIA, JNCIS and JNCIE.

What is GNS3 ?

GNS3 is a graphical network simulator that allows simulation of complex networks.

To provide complete and accurate simulations, GNS3 is strongly linked with:

• Dynamips, a Cisco IOS emulator.
• Dynagen, a text-based front end for Dynamips.
• Qemu, a generic and open source machine emulator and virtualizer.
• VirtualBox, a free and powerful virtualization software.

GNS3 is an excellent complementary tool to real labs for network engineers, administrators and people wanting to study for certifications such as Cisco CCNA, CCNP, CCIP and CCIE as well as Juniper JNCIA, JNCIS and JNCIE.

It can also be used to experiment features of Cisco IOS, Juniper JunOS or to check configurations that need to be deployed later on real routers.

Thanks to VirtualBox integration, now even system engineers and administrators can take advantage of GNS3 to make labs and study for Redhat (RHCE, RHCT), Microsoft (MSCE, MSCA), Novell (CLP) and many other vendor certifications.

This project is an open source, free program that may be used on multiple operating systems, including Windows, Linux, and MacOS X.

Features overview

• Design of high quality and complex network topologies.
• Emulation of many Cisco IOS router platforms, IPS, PIX and ASA firewalls, JunOS.
• Simulation of simple Ethernet, ATM and Frame Relay switches.
• Connection of the simulated network to the real world!
• Packet capture using Wireshark.

Important notice: users have to provide their own IOS/IPS/PIX/ASA/JunOS to use in their labs with GNS3.

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Wireshark - Network Packet Analyzer

What is Wireshark?

Wireshark is a network packet analyzer. A network packet analyzer will try to capture network packets and tries to display that packet data as detailed as possible.

You could think of a network packet analyzer as a measuring device used to examine what's going on inside a network cable, just like a voltmeter is used by an electrician to examine what's going on inside an electric cable (but at a higher level, of course).

In the past, such tools were either very expensive, proprietary, or both. However, with the advent of Wireshark, all that has changed.

Wireshark is perhaps one of the best open source packet analyzers available today.

Some Intended Purposes :-

Here are some examples people use Wireshark for : -

•     Network administrators use it to troubleshoot network problems
•     Network security engineers use it to examine security problems
•     Developers use it to debug protocol implementations
•     People use it to learn network protocol internals

Beside these examples, Wireshark can be helpful in many other situations too.

Features :-

The following are some of the many features Wireshark provides :-

•     Available for UNIX and Windows.
•     Capture live packet data from a network interface.
•     Display packets with very detailed protocol information.
•     Open and Save packet data captured.
•     Import and Export packet data from and to a lot of other capture programs.
•     Filter packets on many criteria.
•     Search for packets on many criteria.
•     Colorize packet display based on filters.
•     Create various statistics.

    ... and a lot more!

However, to really appreciate its power, you have to start using it.

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Learn About Woreshark ...

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