Thesis Topics 2012/2013

September 9th, 2012 Comments off

We have identified a number of research topics that can be worked on as part of a BSc or MSc thesis. Please consult our thesis topics page for an overview and contact us should you be interested to receive more details.


CNDS Web Pages 2.0

July 9th, 2012 Comments off

We are in the process of updating our web pages. We aim at making things more consistent and useful for us and the outside world. One of the new features we added is our new calendar, which can be easily imported into other calendar software. We hope this will make it easier to follow events and deadlines. In order to highlight our activities to improve our pages, we switched to a new theme – wordpress makes all of this remarkably easy.


RFC Word Occurrence

March 23rd, 2012 Comments off

I planned it for a long time, but now seemed to be the right time – just before the next IETF.

Out of curiosity, I wanted to visualize the  occurrence frequency of the following terms over the years: [“MUST”, “MUST NOT”, “REQUIRED”, “SHALL”, “SHALL NOT”, “SHOULD”, “SHOULD NOT”, “RECOMMENDED”, “MAY”, “OPTIONAL”].

Since in majority of cases RFCs represent standards, I was curious to see how the usage of these terms evolved over the years. Of course, a more frequent occurrence of a term “MUST” from year to year does not indicate that the standards have become “stricter” in their statements and requirements, but nonetheless, the dynamics can be observed in the following two graphs.

The first graph (to the right) represents a total number of each keyword/term occurrence over the years. Publication years of the considered RFCs were truncated to 1985-2011, as the occurrence of these terms was minor in preceding years, and 2012 is still underway. “MUST” is a clear dominant among all terms. 2010 witnessed the largest share of “MUST” usage among all RFC document categories. Terms like “SHOULD”, “MAY” and “MUST NOT” have also shown a significant growth. However, the total number of published RFCs has also been increasing over past years, and therefore the graph below normalizes the term occurrence by the total number of RFCs that mentioned any of the terms in the corresponding year. “MUST” is still the dominant term, with a growth rate of ~80% between 2000 and 2010. Terms “MAY” and “SHOULD” follow each other closely. On the other hand, the usage of  terms like “REQUIRED”, “SHALL”, “SHALL NOT”, “SHOULD NOT”, “RECOMMENDED”, “OPTIONAL” between 2000 and 2010 has been steady and low.

There are a number of things that could be further checked, e.g., distribution by document category, according to working groups, correlation with the length of the document, etc., but that will follow at some point in future 🙂

Make your own conclusions (e.g., why do more frequently used terms seem to fluctuate simultaneously?), and feel free to share them with me, as well as any other suggestions on what other interesting stats I could extract from these documents.


IPv6 Traffic is Growing

March 7th, 2012 Comments off

There has been a very positive tendency in the amount of traffic shipped over IPv6. Following the winter break, the amount has increased steadily, and its amount is almost three-fold now, compared to the daily averges of summer 2011. The amount of outgoing IPv6 traffic is still, as expected, very low.


International IPv6 Application Contest 2011

November 1st, 2011 Comments off

Our group applied to participate in the “International IPv6 Application Contest 2011” held by the German IPv6 Council. According to the official page of the Council: “The objectives of this contest are the generation of ideas and applications, which help determine how to introduce IPv6, the Internet of the next generation, on a large scale and use it effectively. The contest also provides an opportunity for the next generation of application developers to gain experience with IPv6.” In accordance with the motto of the contest: “Online on the Road – the new IPv6 Standard as driving forces for mobile communication”, our group submitted a Simple Network Management Protocol (SNMP) implementation for constrained devices, using the 6LoWPAN adaptation layer for IEEE 802.15.4 wireless links. The implementation carries SNMP messages over UDP/IPv6.

The SNMP implementation was wrapped with a number of components to produce a WattsApp telemetry platform. The platform demonstrates remote monitoring of sensor readings. It consists of a hardware interface to read data from S0 metering interfaces that is connected to an exporter running Contiki SNMP. A data collector is collecting meter readings and interfacing to a cloud server. The cloud server provides user authentication (via Facebook) and interfaces with a web front end as well as an Android application. All components of the Contiki SNMP telemetry application communicate via IPv6. The platform allows for easy integration of collected data into Facebook, therefore fostering a discussion on efficient energy usage, saving techniques and spreading the awareness of power consumption by different appliances in everyday life. The platform extends to many other fields of everyday activities like sports, leisure, appliances and utilities monitoring, making monitoring of “things around us” more social.

The implementation was possible due to the efforts of Advanced Distributed Systems Lab students, CNDS group members and several external affiliates.

Please consult the following two brochures for more information about the telemetry platform and the SNMP implementation.

Let’s wait for the results of the selection process in one month! 🙂


IPv6 Update

August 31st, 2011 Comments off

Almost three months passed since the “World IPv6 Day”, and the amount of IPv6 traffic has been almost steady since its first increase on that day.


New Logo for CNDS

July 14th, 2011 Comments off

Our group got a new logo!

The design goal was to make it simple, yet reflecting on the keywords of research carried out within the group: “networks” and “distributed”.

At the same time, the new logo clearly presents the name of the group to the outsider – a feature that the old logo was missing:

Our special thanks go to Dmitry Tsoy [Fb, G+] for being behind the design process of the new logo.


(Word) Cloud Computing

This image shows how the CNDS web pages look like when the content is rendered as a word cloud. This form of “cloud computing” seems to be visually most attractive and it is quite some fun as well.

We used to generate the word cloud image. You can try this online tool easily yourself on other web sites of your personal interest. We found this tool entertaining for a while.




World IPv6 Day @ Jacobs University

June 9th, 2011 Comments off

Graph showing the IPv6 traffic at Jacobs University during the World IPv6 DayYesterday, on June 8th, we enjoyed the World IPv6 Day. Here is how the IPv6 traffic changed during the day (measured on the tunnel connecting Jacobs’ IPv6 network to the German research network). Apparently, some very popular web sites like Google and Facebook turned off IPv6 right after the day again. This is probably not so good news…

For comparison purposes, here is a plot showing all traffic (IPv4 and IPv6)  going in and out of Jacobs University around the World IPv6 Day. This plot seems to indicate that we carried a significant portion of our traffic over IPv6 during the World IPv6 Day. Note that the event took place when most of our undergraduate students had already left our campus.

The plot on the right shows the longer term impact of the IPv6 day. While some  sites apparently turned off IPv6 support once the event was over, there is also good news since our IPv6 traffic remains at significantly higher levels. Obviously some sites used by our users left IPv6 turned on. We will try to keep an eye on this to see whether this is stable over longer terms or increases or decreases over time.


Netconf Light Demo at IETF 80

March 31st, 2011 Comments off

Some of us attended the 80th IETF meeting in Prague and we used the opportunity to demonstrate the NETCONF protocol running on AVR Raven motes (so called class 1 devices). Of course, these devices only support a subset of NETCONF, which we call NETCONF Light. Our goal was to prove that it is possible to implement a workable subset of NETCONF even on very resource constrained devices. On more powerful motes, such as Econotag motes, it should be possible to run an almost complete NETCONF stack.

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