Antispoofing information lost and regained

Though spoofing based attacks have severe consequences and are wide-spread, much of the present day Internet is ill-prepared to defend against them. For effective defense against spoofing, devices at the edge of the Internet have a major role to play. Broadband access concentrators (BAC) are one such set of devices that can help in mitigating the IP spoofing attacks. With the growing use of dynamic assignment of IP addresses to subscribers (e.g., using DHCP), BACs are dependent on dynamically acquired information to do antispoofing. An important and pressing problem is dealing with loss of this information (e.g., because of BAC reboots). The current solution to deal with this problem for DHCP is found to be inefficient and ineffective. We propose a new solution that is efficient and effective.