Read the free chapter of my book - the GNS3 Network Simulation Guide
If that doesn't help, get back to us.
Note: Click on [Free Sample] when the page at packtpub.com/gns3-network-simulation-guide/book opens. If you can't read it on PACKT, try Amazon. http://www.amazon.com/Network-Simulatio ... 782160809/
Disclaimer: I am the author of the GNS3 Network Simulation Guide
-a VMware image of Ubuntu with GNS3 and VPCS installed and a collection of exercises/labs