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@xxxxxxxxxxxxx> > > > 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 >_______________________________________________ >Ietf mailing list >Ietf@xxxxxxxx >https://www.ietf.org/mailman/listinfo/ietf _______________________________________________ Ietf mailing list Ietf@xxxxxxxx https://www.ietf.org/mailman/listinfo/ietf