Member Avatar for grook

Dear all,

I'm please to share you a GNS3 course. The videos has been uploaded to youtube.

PART1
http://www.youtube.com/watch?v=-GwomBC0vwc

PART2
http://www.youtube.com/watch?v=SWafA4SxMJw


GNS3 course

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Good set of walkthroughs from — concise, hands-on material that helps you get a lab up quickly. The snag mentions (not having vendor OS images) is very common; below are legal-friendly alternatives, practical setup pointers, and quick troubleshooting notes so learners can make steady progress without risky downloads.

Licensing first: avoid downloading vendor images from unknown sources. If you have entitlements through work, school, or official training, use those. For hands‑on practice without vendor binaries, run freely available virtual network OSes (VyOS for routing, pfSense/OPNsense for firewall/NAT, or a Linux host with FRRouting/BIRD for dynamic routing). Educational vendor simulators are another legal option for command familiarization.

Practical setup tips: host your lab in a dedicated VM with virtualization enabled, allocate enough RAM/CPU for the appliances you plan to run, and take snapshots before big changes. Use the built‑in packet capture to verify traffic flows; when an end‑to‑end test fails, check (1) interface admin/state, (2) IP/mask and gateway, and (3) ARP entries before reconfiguring. If the host is overloaded, reduce the number of powered devices or increase the host resources.

A short learning progression that scales well: start with basic reachability and interface checks using ping and show ip route (or equivalent), then add VLANs and test inter‑VLAN routing and ACLs, next build a single OSPF area, and finally set up a simple BGP peer to practice advertisements and filters. For certification‑level labs, obtain official lab access or sanctioned vendor images rather than relying on unofficial sources.

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Member Avatar for ryan461

GNS3 is a cool piece of software, I just dont have the IOS to use it :(

Member Avatar for grook

for educational purposes, you can use google :)

Member Avatar for grook

GNS3 Course

[img]http://grook.net/sites/default/files/images/kettaneh/GNS3.png[/img]


What Is GNS3?
GNS3 is a graphical network simulator that allows you to easily design network topologies and then run simulations on them. At the moment GNS3 supports IOS

routers, ATM/Frame Relay/Ethernet switches and PIX firewalls. You can even extend your own network by connecting it to your virtual topology.

GNS3 is strongly linked with :
- Dynamips, the core program that allows Cisco IOS emulation.
- Dynagen, a text-based front-end for Dynamips.
- Qemu, a generic and open source machine emulator and virtualizer.

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

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

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


GNS3 Course outline:
- GNS3 course: Introduction
we discussed the following points
* What is GNS3 ?
* How to download and install GNS3 ?
* Introduction to GNS3 console.
* How to make a small lab and ensure that routers can communicate between each other.

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