This preceding design was created in part to overcome the inability for a host computer to be able to communicate with a guest router. However there are some other limitations that you should be aware of as well.
On a normal physical network, the state of a point-to-point Ethernet interface is dependent on the state of the other end. If one end is shut down or unplugged, the other end is also in a down state. This has implications for routing fail-over scenarios as well as other protocol-timeouts.
In GNS3/Dynamips, if one end of a point-to-point Ethernet link is shut down, it has no effect on the other end. Your topology will be dependent on protocol timeouts or you will need to configure SLAs to trigger fail-over scenarios.
In fact, even if no cable is attached to an Ethernet interface, it will remain in an up state from the moment the no shutdown
command is issued.
This means that if you want to test fail-over scenarios on GNS3 in the same...