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Subject: The FreeBSD-CURRENT TCP/IP Stack does not support D-SACK.
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I view the TCP stack code of  FreeBSD-CURRENT recently. It seems that
current TCP/IP stack does not support D-SACK. Does someone will add D-SACK
support in the future. Windows 7 and linux have add D-SACK supported.

The detail of D-SACK is described in RFC2883.