Method and system for managing data transmission between devices behind network address translators (NATs)

A method for managing peer-to-peer communication among a plurality of devices, the method comprising:

• initiating a request to receive needed data from at least one supplying device, wherein the request causes a server to determine some of the devices to be candidates from a database with many entries, each of the entries pertaining to one of the devices, wherein the determining of the some of the devices is conducted in accordance with at least compatibility of respective network address translators with a network address translator of the requesting device, among the candidates, the server is configured to designate a finalist that is not designated to be a supplying device more often than it should be on average;
• and
• receiving from the server a message including necessary information to initiate a request to the supplying device to download the needed data;
• or
• causing to accept the needed data from the supplying device.

A system for managing peer-to-peer communication, the system comprising:

• a plurality of devices in service;
• and
• a server coupled to a database with many entries, each of the entries pertaining to one of the devices, wherein, upon receiving a request from one of the devices (hereinafter “a requesting device”), the server is configured to determine some of the devices to be candidates from the database in accordance with at least compatibility of respective network address translators with a network address translator of the requesting device, among the candidates, the server is configured to further designate a finalist that is not designated to be a supplying device more often than it should be on average, and
• wherein the requesting device receives from the server a message including necessary information to initiate a request to the supplying device to download the needed data, or is caused to accept the needed data from the supplying device.