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Emile Aben

RIPE NCC Staff — 10 Jul, 2010 04:23 PM
Impressions from the Internet Measurement Conference 2019 by Emile Aben — last modified 04 Nov, 2019 03:20 PM

This year's Internet Measurement Conference (IMC) was held in Amsterdam from 21-23 October. In this article we highlight some of the presented work that we think is interesting and that the RIPE community might find useful.

How Diverse is RIS? by Emile Aben — last modified 14 Nov, 2019 03:58 PM

Is the current set of the RIPE Routing Information Service (RIS) peers providing a good level of diverse data? Let's look at some measurement results.

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.

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.

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.

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).

Measuring More Internet with RIPE Atlas by Emile Aben — last modified 17 Oct, 2016 09:00 AM

RIPE Atlas collects a lot of measurements. But how much of the Internet are we actually measuring? We had a sense that with a limited amount of extra load on the system, we could dramatically increase the number of router IPs seen on a given day in RIPE Atlas - and that means measuring more of the Internet.

A Tale of BGP Collectors and Customer Cones by Emile Aben — last modified 17 Oct, 2016 08:54 AM

When operators and researchers use data from BGP route collectors such as RIS and Route Views, it's not easy to tell if a path announced to a collector is an ISP's customer cone, an internal route, or one learned from peering or transit. In this post we look at what information we can currently get from BGP communities in RIS.

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.

Looking at France-IX with RIPE Atlas and RIS by Emile Aben — last modified 17 Oct, 2016 08:58 AM

This article describes our recent collaborations with France-IX on collecting data plane and control plane Internet data with RIPE Atlas and the RIPE NCC's Routing Information Service (RIS).

Has the Routability of Longer-than-/24 Prefixes Changed? by Emile Aben — last modified 17 Oct, 2016 08:55 AM

In October 2014 we started announcing a few longer-than-/24 prefixes and determined they were not very visible according to the Routing Information Service (RIS) and RIPE Atlas measurements. Now, almost a year later, we revisit this.

The Internet in North Korea - Hanging by a Single Thread? by Emile Aben — last modified 03 Jun, 2019 09:22 AM

North Korea is one of the most secluded countries in the world, but it is nonetheless connected to the Internet. We investigate North Korea's Internet connectivity in light of recent outages and discuss the fragile nature of its setup.

Measuring Countries and IXPs in the SEE Region by Emile Aben — last modified 17 Oct, 2016 08:54 AM

We looked at Internet measurements for the South East Europe (SEE) region in order to share these with attendees at the SEE 4 Meeting that took place from 21-22 April 2015 in Belgrade, Serbia. This is the long version of the lightning talk Vesna Manojlovic gave at SEE 4.

Measuring Countries and IXPs with RIPE Atlas by Emile Aben — last modified 10 Dec, 2019 09:15 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.

#facebookdown? What Internet Measurement Data Shows by Emile Aben — last modified 17 Oct, 2016 08:55 AM

While at this point it is still unclear what exactly happened at Facebook this morning (27 January), we collect data on the Internet control plane (BGP) and data plane that allows us to provide some insight into what happened with Facebook's connectivity to the rest of the Internet.

Distribution of RIPE Atlas Probes by Emile Aben — last modified 17 Oct, 2016 08:53 AM

As the RIPE Atlas network continues to grow, it's useful for ambassadors and potential probes hosts to easily see where we already have probes deployed and where we'd like more probes installed. We created a few useful maps to help with this.

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.

Time Warner Cable Outage by Emile Aben — last modified 17 Oct, 2016 08:54 AM

The Time Warner Cable network suffered an outage on 27 August 2014 between approximately 9:40 and 10:55 UTC. We looked at some interesting details of this outage using RIS and RIPE Atlas.

512K-mageddon? by Emile Aben — last modified 17 Oct, 2016 09:00 AM

A week after the 512K-routes problem started making waves, we took a look at the global effects to see what impact it had. Spoiler: Not much.

Internet Traffic During the World Cup 2014 by Emile Aben — last modified 06 Dec, 2019 10:43 AM

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).

How RIPE Atlas Helped Wikipedia Users by Emile Aben — last modified 17 Oct, 2016 08:58 AM

Engineers from the Wikimedia Foundation and the RIPE NCC recently collaborated on a project to measure the latency of Wikimedia sites for users worldwide. Together, we identified ways to decrease latency and improve performance for users around the world.

A RIPE Atlas View of Internet Meddling in Turkey by Emile Aben — last modified 17 Oct, 2016 08:58 AM

In RIPE Atlas we see latencies to Google's 8.8.8.8 DNS resolver service drop in Turkey. We expect this is due to hijacking of the 8.8.8.8 service. Our measurements show a timeline of these events. Note that even when the Twitter ban had been lifted, RIPE Atlas still saw fake 8.8.8.8 DNS service active in Turkey. In the evening of 7 April the situation returned to normal.

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.

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.

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.

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.

IPv6 ASNs - Network Size Matters by Emile Aben — last modified 17 Oct, 2016 09:00 AM

This article provides statistics about how much IPv4 address space is being announced by networks (ASNs) that are also announcing IPv6 address space. Currently this is about 70% of IPv4 address space.

IPv6 RIPEness - Implementing the Fifth Star by Emile Aben — last modified 17 Oct, 2016 08:54 AM

In this article we present the first publicly available beta version of the fifth IPv6 RIPEness star. This measures real IPv6 deployment from LIRs in the RIPE NCC service region. The methodology is what we think to be the best compromise yet between simple and fair. In this first version, 573 LIRs (>9%) qualify for the fifth star.

Networks With IPv6 Over Time - A Short Update by Emile Aben — last modified 17 Oct, 2016 08:55 AM

We regularly check the status of IPv6 deployment in the RIPE NCC service region, but also in other regions. One way to measure IPv6 deployment is to look at the percentage of networks (Autonomous Systems) announcing IPv6 prefixes and to follow the developments over time.

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.

RIPE Atlas - A Case Study of AAAA Filtering by Emile Aben — last modified 17 Oct, 2016 08:59 AM

At the recent RIPE Meeting, the question was raised whether Internet users would see significant filtering of AAAA DNS queries or replies. We used RIPE Atlas measurements to provide an answer to this question.

IPv6 RIPEness - More Stars by Emile Aben — last modified 17 Oct, 2016 08:59 AM

IPv6 RIPEness helped in creating awareness and got people into action with regards to their first steps towards deploying IPv6 in the RIPE NCC service region. Up until now IPv6 RIPEness didn't measure actual IPv6 deployment. In this article we propose a measure (a "5th star"), which attempts to measure actual IPv6 deployment at the edge.

RIPE Atlas - A Case Study of IPv6 /48 Filtering by Emile Aben — last modified 17 Oct, 2016 08:59 AM

In this article I look at four different IPv6 destinations in different BGP set-ups and how these are seen by RIPE Atlas probes. This reveals some differences in reachability for the different networks, likely due to BGP route filtering. We see roughly 1% out of ~500 RIPE Atlas probes that can't reach a destination in an IPv6 /48 prefix (without a covering shorter prefix) out of IPv6 PA space, likely due to filtering.

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.

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 http://ipv6launch.ripe.net/ .

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.

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.

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.

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.

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.

Hampering Eyeballs - Observations on Two "Happy Eyeballs" Implementations by Emile Aben — last modified 13 Feb, 2020 10:44 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".

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.

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.

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.

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.

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.

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.

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.

RIPE Atlas - the iPad Drawing by Emile Aben — last modified 17 Oct, 2016 08:57 AM

This article is about the lottery of an iPad for people hosting RIPE Atlas probes. As an extra motivator for people to keep their probes up as much as possible, the lottery drawing is weighted based on probe-uptime.

6to4faild by Emile Aben — last modified 23 Mar, 2011 10:23 AM

6to4faild prototype script in scapy (python)

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.

IPv6 RIPEness - The List of 4-star LIRs by Emile Aben — last modified 17 Oct, 2016 08:55 AM

Following up from the IPv6 RIPEness graphs we published earlier, those Local Internet Registries (LIRs) that fulfill all 4 IPv6 RIPEness criteria are now listed on the RIPE NCC web site.

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.

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

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

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.

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 www.ripe.net during the RIPE 60 meeting in Prague. The results are shown in this graph.

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.

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.

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.

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.

REX and Ukrtelecom by Emile Aben — last modified 17 Oct, 2016 09:00 AM

This articles reports from an analysis where we used REX to find out more information about the IP addresses used by Ukrtelecom after they were identified as a spam source.