Multiplayer peer-to-peer connection across firewalls and network address translators using a single local port on the local host

A system of providing peer-to-peer connection among a plurality of host devices, the system comprising:

• a plurality of host devices disposed behind corresponding network address translators;
• and
• a plurality of STUN servers;
• wherein each host device includes a first socket bound to a first private port and a second socket bound to a second private port;
• wherein each host device is configured to send a first STUN packet through the first socket to a first STUN server of the plurality of STUN servers via a public port of the corresponding network address translator, the public port having a public port number identified by the first STUN server;
• wherein each host device is configured to send a second group of STUN packets through the second socket to the plurality of STUN servers via one or more public ports of the corresponding network address translator, the second group of STUN packets being equal in number to the STUN servers, the one or more public ports being different from the public port for the first socket, each of the one or more public ports having a public port number identified by the STUN servers;
• and
• wherein each host device is configured to calculate a predicted public port number of the corresponding network address translator for the second socket, based on the public port numbers of the public ports for the first socket and the second socket, the predicted public port number to be used for peer-to-peer connection between the second socket of the host device and other host devices.