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Network security has become more significant to users computers, associations, and even in military applications. With the presence of internet, security turned into a considerable issue. The Address Resolution Protocol (ARP) is used by computers on a Local Area Network (LAN) in order to map each network address (IP) to its physical address (MAC). This protocol has been verified to function well under regular conditions. Thus, it is a stateless and an all trusting protocol which makes it vulnerable to numerous ARP cache poisoning attacks such as Man-in-the-Middle (MITM) and Denial of service (DoS). However, ARPspoofing is a simple attack that can be done on data link layer profiting from the weak points of the ARP protocol. In this paper, we propose a new method called KARP (Kerberos ARP) to secure the ARP by integrating the Kerberos protocol. KARP is designed to add authentication to ARP inspiring from the procedures used in the famous Kerberos protocol. The simulated results of the new method show the advantage of KARP in highly securing ARP against spoofing attacks providing the lowest computational cost possible.