パケットロスについては、0ではないものの、解決した模様。
でも、ping値劇遅。
低めのping値に合わせて、せっかくRWINの設定したのに・・・。

Reply from 210.81.153.69: bytes=1472 time=486ms TTL=241
Reply from 210.81.153.69: bytes=1472 time=502ms TTL=241
Reply from 210.81.153.69: bytes=1472 time=527ms TTL=241

Ping statistics for 210.81.153.69:
Packets: Sent = 100, Received = 98, Lost = 2 (2% loss),
Approximate round trip times in milli-seconds:
Minimum = 383ms, Maximum = 1093ms, Average = 496ms