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Why can't I achieve full speed on a Symmetrical Internet Connection?

Why can't I achieve full speed on a Symmetrical Internet Connection?

We are using a business Ethernet connection (3Mbit upload, 3Mbit download) and trying to understand issues with our tested bandwidth speeds. When uploading a large file we sustain 340 KB/s; downloading we sustain 340KB/s. However when we run these transfers simultaneously the two transfer speeds rise and fall erratically with a average speed for both at around 250 KB/s. We're using a Hatteras HN404 CPi and we've bypassed the router (plugged a machine directly into the Hatteras; set the NIC to full-duplex).

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