Re: Paper about the web ecosystem

From: Roderick <roderick.fanou_at_imdea.org>
Date: Fri, 8 Jul 2016 10:38:56 +0200

Hello Moonesamy,

Thanks for your feedback. We’ll definitively link you to it.

Regards,

Roderick


On 08 Jul 2016, at 00:56, S Moonesamy <sm+mu_at_elandsys.com> wrote:

> Hi Roderick,
> At 08:25 07-07-2016, Roderick wrote:
>> The 140 GGCs indeed represent the number of Google caches IPs included in the responses of the RIPE Atlas DNS queries and that we further geolocate with our methodology in Mauritius.
>> We are aware of inconsistency in geolocation databases [1]. But as of today the 10 data sources we used in this work are the only open ones that can be adopted for such purposes.
>> To carry out a sanity check, we even performed ping measurements with RIPE Atlas probes to select as country of the IP the one from which the mean of the RTTs to the said IP is the lowest.
>> We however do not have access to any ground truth data against which we can compare such results. Thus, the 140 GGC IPs are the results of the best effort in geolocation that can be done with open data sources as of today.
>> We are currently working on the journal version of the paper which would detect inconsistencies in geolocation with existing databases by comparing with a proprietary geolocation database.
>
> Thanks for the feedback. I encountered a somewhat similar problem which I was working on IPv4 statistics for the region. I ended up doing manual checks when I found out that the results I got did not match local information. It is unfortunately very difficult to get access to ground truth data for the continent. Your methodology actually looks good on a first review.
>
>> Moreover, we only study the way IPs allocated by AFRINIC (and not all RIRs) are served by Google/CDNs. That is the reason why it may appear that the number of caches found in Mauritius is higher than the one in Other regions (or countries).
>
> Yes.
>
>> In this case, Google caches in the United Kingdom are shared to serve Africa.
>> We will look further into the dataset to shed more light on Mauritius in the extended version of this paper.
>
> For at least one network the closer cache seem to be in the United Kingdom. I unfortunately do not have enough data to show whether it is an unusual occurrence. I would be interested to read the extended version of the paper.
>
> Regards,
> S. Moonesamy
Received on Fri Jul 08 2016 - 08:39:12 PST