Hi, I tried the method you mentioned to modify the local IP but some times the packets will not correctly routed out of my pc; (maybe it is because when I bind IP1, tcpip stack try but fail to find a route from IP1->IP3, in this circumstances, I think I need to modify the route table) so, can I modify the routing process using WFP, or I can only add or delete the route table to control the routing process? So can you share me some info. about refreshing the route table manually?