[Bug 243231] TCP/ECN - RFC3168 specifies retransmissions not to be marked ECT in the IP header

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=243231

            Bug ID: 243231
           Summary: TCP/ECN - RFC3168 specifies retransmissions not to be
                    marked ECT in the IP header
           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

While investigating the interaction between ECN and RTO, I noticed that FBSD
sends out retransmissions on ECN-enabled flows with the ECT0 codepoint in the
IP header - which is only permissible with ECN++ (work in progress as IETF
draft).

This is not a critical deviation from the specs, only a lack of conformance.

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