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One of the interesting things about GNS3 and Dynamips is that you can connect your topology to the real world. For some of your CCNA and CCNP studies you may need to run an actual Web browser or Cisco’s Security Device Manager (SDM) among others. Just connect your topology to your real PC. You could even connect to virtual machines running on your computer inside VMware or Virtual PC. I’ve even set up two copies of Windows XP Professional running inside VMware virtual machines. Then I ran Cisco soft IP Phones that could talk to themselves. You could connect your virtual network to a real network as well. Connecting a virtual topology running within GNS3 and Dynamips to real devices is very exciting, but again, your throughput is going to be limited compared to using real equipment for the entire topology. It only makes sense to use GNS3 and Dynamips in a lab environment and for learning purposes. Any other usage is highly discouraged! Connecting your topology to your real PC is very si...

You may also simply add another router to your topology and configure it to act like a PC. This method would use more memory and processor cycles than the previous method, so I would only recommend this method as a secondary choice. Just add a router and enter the following commands: Router(config)# no ip routing (Turns off IP routing function ) Router(config)# interface fa0/0 (Switches to FastEthernet interface) Router(config-if)# ip address address subnet_mask (Assigns IP address and subnet mask to interface ) Router(config-if)# no shutdown (Turns interface on ) Router(config-if)# exit (Returns to global configuration mode ) Router(config)# ip default-gateway (gateway_address Configures the default gateway ) Router(config)# ip http server (Optional – starts http server process Connect the router (acting as a PC) to the rest of your topology.)

The Virtual PC Simulator is a program that runs within Windows or Linux. It has limited functionality, but most important, it allows pings and traceroutes. These are the most common testing commands used during CCNA or CCNP training and are often the only commands needed. Using VPCS you will save memory and CPU cycles. If you do not need more functionality in a workstation within your topology, I highly recommend VPCS. The Virtual PC Simulator is a free product available at the following. Web site: http://wiki.freecode.com.cn/doku.php?id=wiki:vpcs How to install in windows? Download the software here and extract to your folder. You will find file cygwin1.dll in the extracted folder. Go to C:\Program Files\GNS3\Dynamips , search and rename the file cygwin1.dll into cygwin1.dll.old and copy the file cygwin1.dll from your vpcs folder to this folder. Open command prompt, enter the vpcs folder and type vpcs.exe. It is best to open the Virtual PC Simulator before starting GNS3. Welcome to ...