I use the DNAT function to redirect all the traffic to loacl host. Then my application can process the traffic. But I want get the real destination IP before NAT transfer. Is there any function or API, my application can get the relationship between the original IP and the IP after NAT. Best Regards Mike YangTao **************************************************************************** This e-mail and its attachments contain confidential information from HUAWEI, which is intended only for the person or entity whose address is listed above. Any use of the information contained herein in any way (including, but not limited to, total or partial disclosure, reproduction, or dissemination) by persons other than the intended recipient(s) is prohibited. If you receive this e-mail in error, please notify the sender by phone or email immediately and delete it! *******************************************************************************