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OpenStack Networking Cookbook by Chandan Dutta Chowdhury, Sriram Subramanian

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Creating an External Network using Horizon

External Networks have a unique role to play with OpenStack Networking. As we have seen, the DHCP server assigns an IP address from the Subnet to each VM instance. These IP addresses are reachable only in the Network because tenant isolation is required. However, many common deployments require that the VM instances have access to outside networks including the Internet and also be reachable from the outside network.

The main purpose of the external Networks is to allow the VMs to access networks outside the data center and Internet. They also allow the VMs to be accessed from the outside network.

Getting ready

As the external Networks have a special behavior associated with them, only users with an administrative ...

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