ABSTRACT
More and more organizations have included cloud computing in their IT infrastructures. They can either subscribe cloud services from a public cloud provider such as Amazon Web Service or Microsoft Azure or may construct their own private clouds with a virtualization technology such as VMware or Hyper-V. Many organizations have both the public cloud and the private cloud. It may not be easy for the organizations to deal with both the public cloud and the private cloud. They need to use two different cloud access mechanisms, one for the public cloud and one for the private cloud. As the public cloud and the private cloud are constructed on different types of networks, there is no easy way to transmit data between the public cloud and the private cloud. It is also difficult for the public cloud to share the services with the private cloud.
