> 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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