The Address Resolution Protocol (ARP) is a stateless protocol and it has less authentication mechanism for verifying the sender identity, because of these, ARP has always been prone to some kind of security attack like spoofing attacks. Some LAN attacks like DDoS, session hijacking, Man-in-the-middle sometimes starts with ARP spoofing. Currently, passive approach is being used to detect the ARP spoofing which is based on ARP traffic monitoring and finding out the Ethernet-IP address mapping inconsistencies. But passive approach has the more time lag between learning and its detection which is its main drawback. Because of this drawback sometimes spoofing attack is found long after it happens. In this paper, an active and effective technique will be presented for ARP spoofing detection. SCTP INIT and ARP request packets will be injected to locate for inconsistencies. This technique is faster than any other and more effective, reliable than the current passive methods in the detection of attacks. This intelligent technique additionally able to detect the MAC to IP addresses mapping at a reliable and better level of accuracy while on attack. © Research India Publications.