Heh...
The TOS field was designed to mimic the DOD's message preemption scheme - lower
priority messages were only sent if there were no higher priority messages
waiting (a message in this case being more like an email than a packet).
Routine, Priority, Operational Immediate, Flash and Flash Override. Flash
Override messages ALWAYS won.
In 1988, the DDN Program Manager directed the DDN PMO staff to come up with a
way of doing usage-based billing for the MILNET.
Neither of these schemes ever saw real-world implementation/use as far as I
know.
Mike
At 04:03 PM 9/13/2010, Noel Chiappa wrote:
> From: todd glassey <tglassey(_at_)earthlink(_dot_)net>
> Why not simply ask Len Klienrock the answer to this question.
Umm, OK idea, wrong person: Len wasn't around the early Internet development.
I actually vaguely recall discussions about the TOS field (including how many
bits to give to each sub-field), but I can't recall very much of the content
of the discussions. If anyone cares, some of the IENs which document the early
meetings might say more.
Frankly, I doubt we understood the issues that well back then. Remember, this
was the same time period when we put in the 'Source Quench' ICMP message...
Noel
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