Abstract
A virtual network is a computer network which does not contain any physical link between two computational nodes instead they connect through the virtual links. In recent years the virtual network is managed by Software Defined Network (SDN). SDN is one of the most emerging network technologies in the current trends. Most of the companies configure their networks in SDN. It has been found important to understand the security issues that are being raised in any large scale developments from any new technologies that have been raised in recent years. Though the system acquires lot of benefits from SDN the system have to do some little work in security phase. This work confers four kinds of Denial-of-Service (DoS) attacks that are specific to networks in the OpenFlow SDN in different layers. Those attacks are Ping of Death, HTTP Unbearable Load King, SYN flood and Smurf attack. We introduced these attacks in SDN. These have been emulated on Mininet and an analysis is provided that was obtained on the consequence of these attacks. The DoS attack that is more severe than others has been found out and a suitable prevention techniques for that DoS attack is suggested.
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