A method, computer program, and system are disclosed for transferring data. Data packages are transmitted from a plurality of data sources to a first gateway. The data packages are transmitted from the first gateway to a second gateway. The data packages are transmitted from the second gateway to a plurality of data destinations. Acknowledgement messages are transmitted from the data destinations to the second gateway. Pause messages are generated at the second gateway based at least in part on the reception of the acknowledgement messages by the second gateway. The pause messages are transmitted from the second gateway to the first gateway.