Perry E. Metzger writes:
>
> Michael Thomas <[EMAIL PROTECTED]> writes:
> > If you don't believe in signaled QoS, you don't
> > believe in any use of a flow label qua flow label.
>
> I thought we had a "traffic class" to permit "signaled QoS" for some
> value of "signaled QoS". I was unaware flow labels were intended for
> this purpose.
DSCP's aren't guaranteed to be end to end.
> > And XP can make flow labels along with DSCP's as
> > soon as the current or next gen worm is done
> > rewriting their kernels.
>
> I'm an old fashioned kind of engineer. I'd like to see some folks from
> router vendors give us precise information about the *exact* use
> they'll put the flow label information to, and quantitative
> information about how much better it will be for them to have the flow
> label than not to have it. Engineering by committee is bad enough --
> engineering by committee and by hearsay simultaneously is far worse.
If we want to future proof some of the bits,
we can reserve 2 or 4 bits and make 0 be
this definition. This is *hardly* a new and
unexpected semantics fo the flow label. Indeed,
it's seems to be all of the hangwringing over
the obvious definition for these bits that
has managed to shoot IPv6 in the foot, re
fast flow clasification.
But I'm not sure what you're asking for.
Do you really have any doubt that forming
the flow key from fixed postions in the
IP6 header is going to not kick butt on
chasing down header chains with a half
dozen different rules dependent on protocol
value to hopefully find a 5 tuple? Yeah,
yeah, some (edge) routers will have to do that
anyway, but this is *such* a no-brainer
for the host that they deserve lousy (degraded)
service if they can't be bothered to implement
either diffserv or setting flow labels.
Mike
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