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OpenFlow, an essential technology in Network functions virtualization (NFV) implementation, enables software-dened networking (SDN) to develop from a simple concept and divides traditional switch into two parts: a data plane and a control plane. Because software-dened rules are used to control trafc, the concept of NFV was developed. Numerous virtualization studies on NFV have investigated conventional networking hardware, such as firewalls, load-balancers, routers, and managed switches. In this paper, we describe virtualizing a basic switch and implementing a network trafc monitor system. The virtualized switch is used to replace a conventional managed switch and monitor trafc without the need for port mirroring hardware. In addition, OpenFlow is incorporated to manage networking. Cloud computing is increasingly prevalent, and technology is advancing. The proposed system in this paper can be implemented in any networking environment.

In this paper, we use a wildcard mask to implement the load balance method directly on switches or routers and add a user prediction mechanism to dynamically change the range of the wildcard mask; in this way, the load balance mechanism can be applied conforming to real service situations.In our experiment, we tested the accuracies of flow prediction with different prediction algorithms and compared the delay times and balance effects of the proposed method with other load balancers. With the popularity of cloud computing, the demand of cloud infrastructure also increases. As a result, we also applied our load balance mechanism on cloud services and have proven that the proposed method can be easily applied on varieties of service platforms.