NETWORK ADDRESS TRANSLATION DEVICE AND METHOD OF PASSING DATA PACKETS THROUGH THE NETWORK ADDRESS TRANSLATION DEVICE

摘要

A network address translation (NAT) device requests a network server to transmit an invitation packet sent by a first client to a second client, receives a reply invitation packet transmitted by the network server, and passes the reply invitation packet to the first client. The NAT device requests the network server to transmit a session packet sent by the first client to the second client, and receives a reply session packet directly sent from the second client. The NAT device passes the reply session packet through the NAT device to reach the first client on condition that a destination port in the reply session packet is the same as a source port in the session packet, so as to establish communication between the first client and the second client.