International Journal of Computer and Communication System Engineering (IJCCSE)
Security is at the head of all networks, and many companies which implement a comprehensive security policy incorporating many of the OSI layers. However, one area that is usually left untouched is hardening Data link layer and this can open the network to a variety of attacks and admittances. Address resolution protocol supports the mapping of IP address to the MAC address i.e. layer 3 to layer 2 mapping. ARP provides no authentication mechanism to the incoming request packets this is the reason that any client can falsify an ARP message contains malicious information to poison the ARP cache of target host.