>      Thank you for your reminder. Actually, I understand you and
> RFC 2018. What I really concern is how wide support (and being enabled
> by default) SACK has obtained. For we do not always transfer data
> between hosts running FreeBSD and maintained by network expert.

SACK is quite widely deployed.  See:

  Alberto Medina, Mark Allman, Sally Floyd.  Measuring the Evolution of
  Transport Protocols in the Internet.  ACM Computer Communication
  Review, 35(2), April 2005.
  http://www.icir.org/mallman/papers/tcp-evo-ccr05.ps

allman



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