This tutorial will help you build a basic Internet lab using GNS3 as a WAN simulator. It  will be referenced by future tutorials such as how to configure GRE/IPSec VPNs, how to configure a DMVPN (Dynamic Multipoint VPN) and QOS.

The basic steps for building an internet lab with gns3 is to place 4 routers on the lab with one in the middle.


This router represents the internet. Now, connect the other three routers to the Internet with serial cables. Then configure the ISP router ‘s serial interfaces with IP addresses that will be used to connect to the other routers. At this point, we will not be configuring the other routers.




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