Routing data

A node configured to route data in a bi-directional communication session over an overlay network between the node and a second node, the node comprising:

• a performance module configured to determine a plurality of one-way performance measurements for routing data in the communication session in a first direction from the node to the second node via a respective plurality of relay nodes of the overlay network;
• a selecting module configured to select one or more of said relay nodes, based on the determined one-way performance measurements, for use in routing data in the first direction from the node to the second node;
• and
• a routing module configured to route data in the communication session in the first direction from the node to the second node over the overlay network via the one or more selected relay nodes,
• wherein the selecting module is configured to perform said selection of one or more of said relay nodes for use in routing data in the first direction separately to a selection of one or more relay nodes for use in routing data in a second direction from the second node to the first node in the communication session.

A computer program product configured to route data in a bi-directional communication session over an overlay network between a first node and a second node, the computer program product being embodied on a computer-readable storage medium and configured so as when executed on a processor to perform the operations of:

• determining a plurality of one-way performance measurements for routing data in the communication session in a first direction from the first node to the second node via a respective plurality of relay nodes of the overlay network;
• based on the determined one-way performance measurements, selecting one or more of said relay nodes for use in routing data in the first direction from the first node to the second node;
• and
• routing data in the communication session in the first direction from the first node to the second node over the overlay network via the one or more selected relay nodes,
• wherein said selecting is performed separately to a selection of one or more relay nodes for use in routing data in a second direction from the second node to the first node in the communication session.