Summary: Local Area Network (LAN) based attacks are due to compromised hosts in the network and mainly involve spoofing with falsified IP-MAC pairs. Since Address Resolution Protocol (ARP) is a stateless protocol such attacks are possible. Several schemes have been proposed in the literature to circumvent these attacks, however, these techniques either make IP-MAC pairing static, modify the existing ARP, patch operating systems of all the hosts etc. In this paper we propose an Intrusion Detection System (IDS) for LAN specific attacks without any extra constraint like static IP-MAC, changing the ARP etc. The proposed IDS is an active detection mechanism where every pair of IP-MAC are validated by a probing technique. The scheme is successfully validated in a test bed and results also illustrate that the proposed technique minimally adds to the network traffic.