Routing

GNS3 network simulator

• Quagga open source router. Runs on Linux. Fork of Zebra (which is no longer in active development).
• Info about Quagga on Wikipedia.

A few how-to's on using Quagga within GNS3:

• http://www.brianlinkletter.com/using-open-source-routers-in-gns3/
• http://www.brianlinkletter.com/set-up-gns3-with-open-source-routers/