![]() ![]() You will need to define another virtual switch, from the “add networking” option, and take care not to bind this to any physical adapter. You should already have at least one virtual switch (vSwitch0 in the screenshot above), which is already bound to a physical adapter (vmnic0 in the screenshot above). In vSphere, click on the ESX server > configuration tab > networking. Next, we go on to define the virtual network in ESX. For example, if you want to add a virtual DMZ to the cisco, you will need 2 NICs defined. Next, I provisioned a VM using ubuntu and 2 NIC cards.ĭepending on how many interface your virtual cisco will use, you will need to define as many NIC cards on the host. As a virtual client (the virtual PC in my diagram above) I chose to use windows XP, and so provisioned a VM with that OS. So the first step is defining all the nodes we’ll need in the above. (side note, the above is only one permutation of possible networks, you can define different network topologies limited only on how many physical interfaces the ESX server has) Since the virtual cisco router has 2 interfaces in the above diagram, we need 2 interface bridges. I went with a standard linux distribution (ubuntu) for one major reason, which is that linux supports more than one interface bridge, whereas in windows XP for example, you can only define a single interface bridge. In this article, we basically run the virtual cisco router in a GNS environment hosted on a linux machine. TAP interfaces and vmware ESX server gave a much more stable and easy solution. I’ve already touched on this in one of my previous blog posts, but when using that solution I sometimes run into ARP and routing problems that while surmountable, weren’t the most intuitive problems to solve. Often time during testing you’d need something like: There are also very good guides that explain how to bridge your physical LAN to the virtual cisco lab. There are quite a bit of guides on how to use GNS3 to build a virtual cisco lab. ![]() Trying to do more with less is definitely one aim that virtualising helps you achieve. ![]()
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