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That did it. I set the MTU to 1500 and the RWIN to 192096, as suggested by dslreports.com, and the speed jumped to 15Mbits. Thanks to everyone.



While it's still fresh in your mind, you should now go back and change that MTU to 1476. Otherwise you will be very confused some day in the future when sending email from that machine --> any message that exceeds one packet will probably fail until you fix the MTU.

Cheers