Information has become an organization’s most precious asset. Organizations have become increasingly dependent on information. The widespread use of e-commerce has increased the necessity of protecting the system to a very high extent[1]. Denial of Service (DoS) is a security threat which compromises the confidentiality of information stored in Local Area Networks (LANs) due to unauthorized access by spoofed IP addresses. DoS is harmful to LANs as the flooding of packets may delay other users from accessing the server and in severe cases, the server may need to be shut down, wasting valuable resources, especially in critical real-time services such as in e-commerce.
The term security refers to the protection of essential information against unauthorized access. There are many types of threats that violate the information that can be accessed by global network: theft and fraud, hackers, Denial of Service (DoS) and virus . In addition, it is difficult to make a global secure system for the entire network (i.e. the Internet). Any violation in security leading to loss of confidence and loss of privacy could lead to illegal action taken against an organization. On the other hand, loss of data integrity results in invalid or corrupted for information. Hence, losing any factor of these criteria would cause significant
harm in business for the organization assets such as loss customer confidence, contract damages, regulatory fines and restrictions, or a reduction in market reputation. In the worst case, a failure to control or protect information could lead to significant financial losses or regulatory restrictions on the ability to conduct business.