As you can see, GNS3 does an awesome job with simulating real life networks. In this lab, I simulated two Cisco 3700 Series Routers running EIGRP with the autonomous system ID of 12. The two routers are connected via Serial and the network layout is as follows:
192.168.2.2 (My real life network adapter; I can communicate with the virtual network from the real world)
192.168.2.4 (R1’s Fast Ethernet0/0 adapter, in order to communicate with the outside world)
192.168.15.10 (AS12) – Network connection in order to bridge the two networks together (192.168.2.0 and 174.16.34.0)
192.168.15.11 (AS12) – Network connection in order to bridge the two networks together (192.168.2.0 and 174.16.34.0)
174.16.34.1 – Virtual FastEthernet0/0 interface on other side of virtual network.
In the end, I was able to ping from my real Windows laptop to R2’s FastEthernet0/0 interface (172.16.34.1). Although I had to add the routes manually in Windows, this still proves connectivity from the real world to the virtual world.
(Originally posted on September 28th, 2015. Updated on December 29th, 2020)