Patent ID: 8316433

Claim:
A method to prevent IPv6 packet forgery in an Internet Protocol version 6 (IPv6)-Internet Protocol version 4 (IPv4) network in a dual stack transition mechanism (DSTM) environment, the method comprising: receiving, at a DSTM server from a DSTM node, a request for assignment of an IPv4 address; determining, at the DSTM server, whether the request is reasonable using a stored dynamic address table; assigning, at the DSTM server, the IPv4 address to the DSTM node if the request is reasonable, and updating the dynamic address table to contain mapping information of the IPv4 address assigned to the DSTM node; transmitting, at the DSTM server, the assigned IPv4 address to the DSTM node; and transmitting, at the DSTM server, the updated dynamic address table to a DSTM border router; and synchronizing the dynamic address table of the DSTM server with a dynamic address table of the DSTM border router, wherein information of the DSTM node comprises at least a media access control (MAC) address and an IPv6 address of the DSTM node, and wherein determining, at the DSTM server, whether the request of the DSTM node is reasonable comprises determining, at the DSTM server, whether the dynamic address table comprises the MAC address and the IPv6 address of the DSTM node.