Patent ID: 7577144
Filing Date: 2009-08-18
Classification: H04L

Abstract:
1. A dynamic network address translation method of transparent private network device for allowing a first device in a public network to connect to a second device in a private network via a NAPT router, comprising: (A) the first device in the public network sending a domain name request packet to inquiry an IP address corresponding to domain name of the second device; (B) the NAPT router intercepting the domain name request packet and responding a domain name reply packet having an outer IP address; (C) the first device using the outer IP address as destination address and a registration port corresponding to the NAPT router as a destination port-to send the NAT router a connection registration request packet having a service port corresponding to the device; (D) after receiving the connection registration request packet, the NAPT router selecting a data port corresponding to the service port, thereby establishing a translation relation between the outer IP address/data port and the private IP address/service port; and (E) the first device and second device performing bi-directional communication by using the translation relation.