Re: Drops in Core

[William Herrin <bill () herrin us>]

On Sun, Aug 16, 2015 at 8:00 AM, Patrick W. Gilmore <patrick () ianai net> wrote:
> On Aug 15, 2015, at 1:41 PM, Job Snijders <job () instituut net> wrote:
> > On Sat, Aug 15, 2015 at 11:01:56PM +0530, Glen Kent wrote:
>
> > > Is there a paper or a presentation that discusses the drops in the core?
> > >
> > > If i were to break the total path into three legs -- the first, middle
> > > and the last, then are you saying that the probability of packet loss
> > > is perhaps 1/3 in each leg (because the packet passes through
> > > different IXes).
> >
> > It is unlikely packets pass through an IXP more then once.
>
> “Unlikely”? That’s putting it mildly.
>
> Unless someone is selling transit over an IX, I do not see how it
> can happen. And I would characterize transit over IXes far more
> pessimistically than “unlikely”.

Hi Patrick,

I'm told it happens relatively often in networks supporting a lot of
schools. Being an unpaid pass-through for schools paying other ISPs
functions as a loss-leader that attracts more schools as customers.

Regards,
Bill Herrin



-- 
William Herrin ................ herrin () dirtside com  bill () herrin us
Owner, Dirtside Systems ......... Web: <http://www.dirtside.com/>