[ih] TTL [was Exterior Gateway Protocol]

[vinton cerf]

i agree with Casner on this one.
v


On Sat, Sep 5, 2020 at 5:04 PM Stephen Casner via Internet-history <
internet-history at elists.isoc.org> wrote:

> On Sat, 5 Sep 2020, Jack Haverty via Internet-history wrote:
>
> > 4/ TTL was also intended for use with different TOS values, by the
> > systems sending voice over the Internet (Steve Casner may remember
> > more).  The idea was that a packet containing voice data was useless if
> > it didn't get to its destination in time, so TTL with a "fastest
> > delivery" TOS enabled the sender to say "if you can't deliver this in
> > 200 milliseconds, just throw it away and don't waste any more
> > bandwidth".   That of course wouldn't work with "time" measured in hops,
> > but we hoped to upgrade soon to time-based measurements.
>
> I don't recall any discussion of that idea while we were developing
> RTP.  As you say, the units being in hops rather than time would make
> this mechanism imprecise, and the variability in the diameter of the
> network would make it hard to use.  Multicast complicates that even
> further.
>
>                                                         -- Steve
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