vCloud Air - Connecting a Virtual Machine to an Isolated Network

When you build a virtual data center in vCloud Air, the service automatically creates an isolated network and a routed network for you. Here, we take a look at how a virtual machine is connected to the isolated network.

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Specifically, we talk about the following basics for isolated networking:

1. View the Isolated Network Settings

To view the settings for the isolated network:

  1. If you’re not already logged in, go to and log in to vCloud Air.
  2. From the Dashboard, click the desired virtual data center.
  • In this example, we use the SHAREPOINT virtual data center.

3. Click the Networks tab to see the default isolated network.

  • The isolated network is not routed through the edge gateway, so there is no connectivity to the Internet or anything else.
  • An internal subnet is automatically assigned.
  • An IP range is automatically created and assigned. Here, the range is .2 through .100.

2. View the Virtual Machines on the Isolated Network

To view the virtual machines deployed on the isolated network:

  1. Go to the Virtual Machines tab and identify a virtual machine to view more closely.
  • This example uses the win2k3vm virtual machine.

2. From the pull-down menu, select View & Edit Details.

3. Click the virtual machine’s Networks tab to review its information.

  • The virtual machine in this example is on the default isolated network, with an IP address of
  • This virtual machine is on the internal network, and there is no way for it to connect to the Internet.

4. Click Virtual Data Center Details to go back to the main virtual data center screen.

5. Click the Networks tab to go back to the isolated network for this virtual data center.

  • Here you can see that is the first IP address in this range.

3. View the Services on the Isolated Network

To view all the services already set up on the isolated network:

  1. Still on the Networks tab, click Manage in vCloud Director to launch the vCloud Director UI.
  2. Click the Org VDC Networks tab to see both the default isolated and default routed networks.

  3. Click the isolated network and then select Configure Services to see the active services associated with it.

  • The only active service for isolated networks is DHCP, so this is the only thing you can configure.
  • In this example, there is a DHCP range of through
  • Note: Remember that the static IP range is through, and the virtual machine we viewed has a .2 IP address instead of .101. This is because the virtual machine is currently taking an IP address from the actual range on the network and not from the DHCP service.

4. Set the IP Mode

The IP Mode is a setting that lets you choose how the IP address should be assigned to a virtual machine. To set the IP Mode:

  1. In the vCloud Director UI, click the vApp tab, select a virtual machine, and then click Open.

  2. On the Virtual Machines tab, click the virtual machine and select Properties.

  3. Click the Hardware tab to review the IP Mode.

  • The following table describes the options for the IP Mode in more detail.
  • Note: The Static – IP Pool and Static – Manual options will only work if VMware tools are installed, but DHCP will work for all virtual machines. DHCP is preferred if your virtual machine is new or does not yet have VMware tools installed.
IP Mode Option Origin of IP Address
DHCP The IP address will be assigned from a DHCP range, with the Edge Gateway actually working as a DHCP router. In this example, DHCP range is .101 through .254.
Static - IP Pool The virtual machine will take an IP address from the range specified in the network. In this example, the IP range is from .2 through .100.
Static - Manual The administrator types in a specific address.

4. Still in the vCloud Director UI, return to the Org VDC Networks tab, select the default isolated network, and then click Properties.

5. Click the Network Specification tab and review the information.

  • In this example, the virtual machine is getting its IP address from the .2 to .100 range because it was set to Static – IP Pool rather than DHCP.