Modern VLBI experiments demand transfers of up to several terabytes per day, and though modern research and education networks have backbone bandwidths of up to 10 Gbps and should be easily able to handle this load, at this speed, traditional transport options (TCP/UDP) do not perform/behave well. Many enhancements have been proposed to TCP, in particular, to improve its performance in high speed networks, however, they are not yet widely deployed. In the interim, advanced application layer transport protocols offer an alternative, easily deployable and effective solution. In this paper, we discuss some of these protocols and look at the results of some tests using these protocols. Some of these protocols are still experimental, so they should be used/deployed only after extensive reliability and fairness testing. However, they do provide a relatively easy and efficient way in which to improve data transport rates across high speed, long round trip time networks.
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