Drops in Core

Sun Aug 16 12:44:50 UTC 2015

On Sun, Aug 16, 2015 at 8:00 AM, Patrick W. Gilmore <patrick at ianai.net> wrote:
> On Aug 15, 2015, at 1:41 PM, Job Snijders <job at 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 at dirtside.com  bill at herrin.us
Owner, Dirtside Systems ......... Web: <http://www.dirtside.com/>