[Bug 235959] DSACK not working

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=235959

            Bug ID: 235959
           Summary: DSACK not working
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: rscheff at gmx.at

FreeBSD claims compliance with RFC2883 (DSACK) 
https://wiki.freebsd.org/action/login/TransportProtocols/tcp_rfc_compliance

but a recent test on HEAD does not show the transmission of DSACK blocks on
deliberatly sent, duplicate data segments.

The bug may exist in older releases already, can not check currently.

tuexen@ may have an update on this too.

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