You are here: Home > Publications > RIPE Labs > Emile Aben

Emile Aben

RIPE NCC Staff — 10 Jul, 2010 04:23 PM
Sketching Connectivity Between Users by Emile Aben — last modified 04 Jun, 2018 09:51 AM

We're looking at user-to-user connections, based on RIPE Atlas measurements and ISP's end-user market share estimates provided by the APNIC.

Does The Internet Route Around Damage in 2018? by Emile Aben — last modified 26 Jun, 2018 02:53 PM

On the night of 9 April 2018, DE-CIX Frankfurt experienced an outage. As this is one of the largest Internet Exchange Points, this is an interesting case to study in more depth to see what we can learn about Internet robustness. We plan to update this article if new information/corrections flow in.

6to4 - Why is it so Bad? by Emile Aben — last modified 08 Jan, 2018 10:14 AM

In a previous article we measured that a large percentage of 6to4 connections fail. In this article we show our attempts to find out why these connections fail.

Impressions from the Internet Measurement Conference 2017 by Emile Aben — last modified 30 Nov, 2017 02:43 PM

This year's Internet Measurement Conference (IMC) was held in London from 1 - 3 November. In this article we highlight some of the presented work that we think is interesting and that the RIPE community might find useful.

Interesting Graph - IPv6 RIPEness Movie by Emile Aben — last modified 08 Nov, 2017 08:41 PM

After creating a rating system, in which RIPE NCC members can get up to four “stars” for IPv6 services, depending on certain criteria, we now looked at the increase of IPv6 RIPEness over time. See this illustrated in this movie.

Insights from RIPE Atlas Probe Disconnections by Emile Aben — last modified 16 Oct, 2017 04:16 PM

There are all kinds of reasons why RIPE Atlas probes might become disconnected. So, even though we'd like all probes to be connected all the time, disconnects can also tell us a useful story.

Large BGP Communities - Largely Accepted Now? by Emile Aben — last modified 04 Sep, 2017 11:31 AM

Large BGP Communities are an addition to BGP that solves a communication problem between networks that want to use 32-bit AS Numbers. We measured how Large BGP Communities behave "in the wild" and if they create any problems.

Iran and K-root: The Rest of the Story by Emile Aben — last modified 09 Apr, 2019 09:30 AM

Dyn Research published an article on K-root recently. Here we would like to augment the picture with data from RIPE Atlas in order to provide a more complete picture of the effect of the K-root node in Iran.

Interesting Graph - IPv6 per LIR by Emile Aben — last modified 24 Aug, 2017 09:14 AM

Often when looking at IPv6 deployment statistics, the size of the organisation or the network is not taken into account. In this article, we look at IPv6 deployment of Local Internet Registries (LIRs) per country in correlation with the size of the LIR.

Internet Traffic During the World Cup 2014 by Emile Aben — last modified 10 Nov, 2019 01:58 PM

The World Cup is one of the most watched events on the planet, and we've been looking at traffic changes at Internet Exchange Points during the matches in Brazil at World Cup 2014. The final part of our analysis is now available, with a look at what happened during the final four matches of the tournament (section 4).

The Curious Case of 128.0/16 by Emile Aben — last modified 10 Jul, 2017 09:46 AM

The prefix 128.0/16 is filtered in Juniper devices up to and including JUNOS software version 11.1. We looked at three ways to get a rough estimate on how much filtering of 128.0/16 is going on on the Internet.

Hampering Eyeballs - Observations on Two "Happy Eyeballs" Implementations by Emile Aben — last modified 03 Jul, 2017 09:18 AM

In this article we look at two "Happy Eyeballs" implementations, that aim to reduce degraded user experience as the result of broken dual-stack configurations. We call this degraded user experience "Unhappy Eyeballs". The Chrome web browser implementation seems to succeed in this aim, while Apple's Mac OS X Lion operating system only partially succeeds in avoiding "Unhappy Eyeballs". Furthermore we show that Mac OS X Lion, in combination with the Safari web browser results in "Happy Eyeballs", but leaves well performing native IPv6 capacity unused in roughly half of the cases we measured, a condition we name "Hampering Eyeballs".

RIPE Atlas - Superstorm Sandy by Emile Aben — last modified 20 Jun, 2017 09:33 AM

After causing lots of damage in the Caribbean, superstorm Sandy is having a devastating effect on the US East Coast. We looked at the RIPE Atlas network to find out what effects this superstorm has on the Internet. Below are some preliminary results of what we saw.

Unsolicited Internet Traffic from Libya by Emile Aben — last modified 05 Jun, 2017 10:42 AM

Amidst the recent political unrest in the Middle East, researchers have observed significant changes in Internet traffic and connectivity. In this article we tap into a previously unused source of data: unsolicited Internet traffic arriving from Libya. The traffic data we captured shows distinct changes in unsolicited traffic patterns since 17 February 2011.

Propagation of Longer-than-/24 IPv4 Prefixes by Emile Aben — last modified 16 Apr, 2019 09:34 AM

Under ARIN's Number Resource Policy Manual (NRPM) Section 4.10, the IPv4 address block 23.128/10 is reserved for allocations and assignments dedicated to facilitate IPv6 deployment. The maximum allocation size is a /24; the minimum allocation size is a /28. There has been much discussion on the NANOG mailing list about the usability/routability of prefixes longer than a /24. In order to try to provide some additional data on this topic, the RIPE NCC has requested a small block of address space from the reserved /10 to test these types of prefixes.

RIPE Atlas - Packet Size Matters by Emile Aben — last modified 14 Mar, 2017 10:57 AM

This new RIPE Labs article talks about trying to send large packets over the Internet. Above a certain size, these packets will have to be fragmented, which is known to cause problems. In both IPv4 and IPv6, we see approximately 10% of RIPE Atlas probes that are unsuccessful in pings with fragmented packets, while they don't encounter problems with smaller unfragmented packets.

Infrastructure Geolocation - Plan of Action by Emile Aben — last modified 06 Mar, 2017 09:51 AM

At RIPE 67 we presented our ideas on infrastructure geolocation. We received positive feedback for developing this idea. This article shows the current thinking on how to develop router geolocation further. Any feedback will be appreciated.

Measuring Countries and IXPs with RIPE Atlas by Emile Aben — last modified 27 Jan, 2017 10:27 AM

We've been working with various Internet Exchange Points (IXPs) over the last few months to see how RIPE Atlas active measurements can provide insight into how they are keeping local traffic local. This could help improve performance and efficiency for IXPs and their members. To explore this, we've created a set of Python scripts to analyse Internet traffic paths between RIPE Atlas probes in a given country and try to identify whether they traverse IXPs.

Measuring World IPv6 Launch Participants From All Over The World by Emile Aben — last modified 01 Dec, 2016 12:31 AM

Similar to last years World IPv6 Day, this year, the RIPE NCC is measuring selected World IPv6 Launch participants from over 50 vantage points all over the world. We're measuring DNS, ping, traceroute and HTTP and show results at .

F-root IPv6 Route Leak - the DNSMON View by Emile Aben — last modified 01 Dec, 2016 12:29 AM

This weekend the NANOG mailing list was abuzz about an F-root IPv6 route leak, that resulted in the F-root DNS server instance located in Bejing, China, being queried from outside of China. This normally doesn't happen, as this instance is advertised with the BGP attribute NO_EXPORT, which means it should not be visible outside of immediate neighbor Autonomous Systems (ASes). We looked at the DNSMON data about this event, and found that 5 out of 29 IPv6-enabled DNSMON monitors saw the Bejing F-root instance. We also found there was an earlier leak on 29-30 September.

Interesting Graphs - Priming Queries to the Root Servers by Emile Aben — last modified 01 Dec, 2016 12:28 AM

There was a slight increase in the number of sources that issue priming queries to DNS root servers seen on 18 March 2010, right after the introduction of a signed .arpa zone. See here an analysis and some graphs.

A Look at DNS Priming Queries to K-root by Emile Aben — last modified 01 Dec, 2016 12:21 AM

In this article we take a look at DNS priming queries arriving during the deployment of a DNSSEC signed zone at the DNS root servers. We are specifically looking for potential problems as a result of this deployment.

When Does World IPv6 Day Start? by Emile Aben — last modified 01 Dec, 2016 12:13 AM

World IPv6 Day is on 8 June 2011. On this day, a lot of organisations, including some of the most popular ones like Google, Yahoo and Facebook, are going to provide IPv6 addresses for AAAA queries for their websites. This will make content available over IPv6 for one full day. Since DNS responses are often cached, some users won't see this change immediately. In this article we look at how DNS caching affects the start of World IPv6 Day, and how World IPv6 Day participants can minimise these effects.

Growth in IPv6 Capable DNS Infrastructure by Emile Aben — last modified 01 Dec, 2016 12:09 AM

We developed a script to measure IPv6 capabilities of DNS resolvers and clients two years ago. Recently we found some interesting trends in IPv6 capable DNS infrastructure.

Measuring IPv6 Connectivity with RIPE Atlas - How Do Others See Your IPv6 Network? by Emile Aben — last modified 01 Dec, 2016 12:08 AM

We've enabled RIPE NCC members to do IPv6-traceroutes from all RIPE Atlas probes to IPv6 destinations. Until now they could get the raw analysis results (text/JSON representations of traceroute results) for analysis. In this article we present a first experimental analysis and visualisation of the traceroute results.

Changes to RIPE Atlas Raw Data Structure by Ann Barcomb — last modified 01 Dec, 2016 12:06 AM

With the introduction of a new firmware version for RIPE Atlas probes, the structure of the measurement results will be changing. Anyone making use of the raw results is advised to read about these upcoming changes and to subscribe to our RSS feed or subscribe to our mailing list to be notified of future firmware releases.

Connectivity to the K-Root Instance in Delhi by Emile Aben — last modified 30 Nov, 2016 11:56 PM

As a follow-up to the previous article and prompted by a question in the mailing list, we looked into connectivity of one particular instance of K-root: the one located in Delhi. India.

World IPv6 Day - IPv6 Eye Chart by Emile Aben — last modified 30 Nov, 2016 11:41 PM

The RIPE NCC is doing some measurements for World IPv6 Day. One of them is the IPv6 eye chart, a web page that allows you to test your connectivity to selected dual-stacked web sites and World IPv6 participants. The goal is to see if an end user has connectivity problems to dual-stacked websites. This is an increasingly rare problem, but still perceived important enough to prohibit content providers to go dual-stack.

IPv4 Address Space Growth per Country by Emile Aben — last modified 30 Nov, 2016 11:29 PM

With the depletion of the IPv4 free pool in the APNIC region and the imminent IPv4 free pool run out in the RIPE NCC's service region, it is interesting to look at IPv4 allocation rates per country to see where free pool run out has and will have the most consequences, in terms of curtailing growth of IPv4 address usage. In this article, we try to visualise where "the pressure is on" the most.

Typhoon Haiyan - What we see in RIPEstat and RIPE Atlas by Emile Aben — last modified 30 Nov, 2016 11:29 PM

As one of the strongest typhoons on record, Haiyan is feared to have a devastating effect on the Philippines. We looked for evidence of its effects on the country's core Internet infrastructure. At first glance, the typhoon's impact on core Internet infrastructure appears to be modest. This is in stark contrast with the expected humanitarian situation in the affected area.

Internet Access Disruption In Turkey - July 2016 by Emile Aben — last modified 30 Nov, 2016 11:27 PM

With the attempted coup in Turkey, reports went out about social media being throttled and/or blocked. We analysed data about this that we collected with RIPE Atlas and the Open Observatory of Network Interference (OONI).

Interesting Graph - IPv6 Performance by Emile Aben — last modified 30 Nov, 2016 11:20 PM

This graph shows IPv6 performance as measured to These measurements show performance of native IPv6 on average being very close to IPv4.

Interesting Graph - IPv6 and RIPE 60 by Emile Aben — last modified 30 Nov, 2016 11:11 PM

We measured the number of web clients connected to during the RIPE 60 meeting in Prague. The results are shown in this graph.

Measuring World IPv6 Day - Some Glitches And Lessons Learned by Emile Aben — last modified 30 Nov, 2016 11:00 PM

As already stated by us and others, World IPv6 Day on 8 June, was a big success. No major issues came to light, and most minor issues that surfaced were resolved, and as such were a useful learning experience. In this article we provide details on some of the events we observed by looking at our measurement data.

Interesting Graph - Networks with IPv6 over Time by Emile Aben — last modified 30 Nov, 2016 10:55 PM

This infographic shows the percentage of networks (autonomous systems) that are IPv6 enabled from 2004 up until now. The interactive graph allows for comparison between IPv6 deployment in countries, and groups of countries.

Measuring IPv6 at Web Clients and Caching Resolvers (Part 1) by Emile Aben — last modified 30 Nov, 2016 10:43 PM

It is important to keep an eye on how the IPv6 Internet develops. We wrote a script to measure the IPv4 capability, IPv6 capability and IPv4/IPv6 preference of end-users visiting our site. What is unique about this script is that it allows us also to measure the caching DNS resolver that the end-user system is using.

IPv6 RIPEness - the Sequel by Emile Aben — last modified 30 Nov, 2016 10:41 PM

As a follow-up to the article IPv6 RIPEness of LIRs, we did more analysis based on LIR signup year, size and the industry sector that the LIR operates in.

6to4 - How Bad is it Really? by Emile Aben — last modified 30 Nov, 2016 10:41 PM

At the recent RIPE 61 meeting in Rome and at earlier meetings, we heard that connectivity over 6to4 is not very dependable, which hampers IPv6 deployment. I wondered how bad it really is and started measuring it. This article describes what I measured and shows the results. Spoiler: It's pretty bad.

Measuring World IPv6 Day - Comparing IPv4 and IPv6 Performance by Emile Aben — last modified 30 Nov, 2016 09:43 PM

During World IPv6 day we measured the performance of IPv4 and IPv6 between 40 vantage points and 46 World IPv6 Day participants and other dual-stacked sites. If one has to pick a winner, then the old protocol, IPv4, would win, but IPv6 often shows comparable or better performance.

Internet Disruptions in Sudan by Emile Aben — last modified 30 Nov, 2016 09:21 PM

Significant Internet disruptions are happening in Sudan, possibly as a reaction to riots. We use RIPE NCC tools to get a better understanding of what is going on.