Internet Traffic Discovery?

didn't we all already know this?


Date: Wed, 6 Jun 2001 10:54:56 -0400
From: Craig A. Haney <>

didn't we all already know this?

Journalists. *snort*

I know that _I_ did, and I'm no backbone engineer... it's a matter of

Anybody else remember a recent thread arguing that QoS should be kept at
the edge for IP?



[ Their surprising discovery - that traffic on heavily loaded,
   high-capacity network links is unexpectedly regular ]

These characteristics had been pointed out by Bill Barns and MO in the
core of a promising local ISP. The phrase used was something like "city
pair macro flows are long lived and stable." It is good to get some
formal research into this, backing up emperical data.


I thought that we "knew" that, according to self-similarity, burstiness would be seen at all levels of aggregation.

I wonder if scaling rules apply as the aggregation increases (backbones). That is, at high levels of aggregation, would we have to look at smaller time intervals to see the burstiness? Don't know if the Ball Labs folk did that.


I believe Dennis Ferguson brought this assumption under reasonable doubt
using data from MCI a while back.


also interesting would be experimentation in determining what level of
route oscillation breaks this axiom. is the stability of macroscopic
flows retained for all but macroscopic route oscillation? does it remain
even for macroscopic route oscillation?

thinking it reasonable to believe that macroscopically
internet routing is static?

The Bell Labs guys only used "hundreds of gigabytes" of "real" packet data,
which if I am not mistaken is only a few minutes of traffic on any high
speed link.

The more concerning issue with the article (I found) was that they
"simulated real data". What does this mean? How can you simulate something
you are trying to study without prejudicing your results?

But yes, I think I have heard/seen "macro flows are long lived and stable"
before, but didn't know who to credit it to.

Deepak Jain

Very possible, Dorian. I have not been following very carefully. Thanks for pointing this out. BTW. please note my use of " " around "knew." --SteveG

I believe Dennis Ferguson brought this assumption under reasonable doubt
  using data from MCI a while back.
to quote his operationally spiced eloquence apr 1997

(and if I hear `self-similarity'
  one more time I'm going to barf)

OK, sorry. I had not kept up with the times. --SteveG