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TU Berlin

Inhalt des Dokuments

Talks, student talks, and other events of 2017

Tuesday, 26. April 2016

Multi-Homed on a single link Exploiting IPv6 flexibility to enable MultiAccess
Speaker:
Bernd May
Type:
Masterstudent final talk
Time:
11 April 2017
15:00–16:00
Place:
MAR 4.033
Abstract:
Smart mobile devices with WWAN internet access have become ubiquitous. These de- vices can share this access and act as gateways in existing computer networks, i.e. via tethering. If a computer already has a connection to the internet via an existing ac- cess gateway, it effectively becomes multi-homed, enabling the use of both gateways at the same time. Unfortunately, barring the use of Multipath TCP, common applications rarely avail themselves of this opportunity. In addition, tethering is usually combined with a single computer device only, even though the additional access gateway could potentially share its internet connection with multiple devices in the same network, e.g., via WIFI. Due to lack of network auto-configuration support, most computer devices can not handle additional access gateways automatically, preventing widespread use of this technology.

Therefore this thesis evaluates the standard network auto-configuration protocols DHCPv6 and Stateless Address Autoconfiguration for the possibility to provide support for multiple access gateways in the same network. In addition it provides a proof of concept enhancement to the DHCPCD client software, enabling multi-access host configuration via policy routing. The thesis also contains a multiple recursive DNS resolver configuration as a sample solution for common applications benefiting from multiple access gateways.

Wednesday, 22. March 2017

Data Aggregation in Apache Flink
Speaker:
Karl-Philipp Wulfert (TU Berlin bachelor student)
Type:
Bachelorstudent final talk
Time:
22 March 2017
09:30–10:30
Place:
MAR 4.033
Abstract:
This thesis evaluates different approaches to implement a Top-K calculation in Apache Flink with distributed data sets. The goal is to stay close to the dataflow paradigm of the framework and to use its provided functions and patterns to build implementations that are especially low in bandwidth consumption and other possible overheads. Because that proved to be too restrictive the goal was to enhance the framework or at least push the boundaries a little further to explore different and more possibilities to achieve efficient implementations. The different approaches are then evaluated: On the one hand how invasive the changes are that were made to the original framework and on the other hand how efficient they are. Finally the results of the evaluation is concluded and work to develop the framework further is proposed to enable better solutions.

Tuesday, 14. March 2017

Approximating Virtual Network Embeddings using Randomized Rounding
Speaker:
Matthias Rost
Type:
Project group meeting (Projektgruppentreffen, PGT)
Time:
14 March 2017
15:00 - 16:00
Place:
MAR 4.033

Tuesday, 07. March 2017

Bridging The Gap: Towards Rigorous Data Plane Verification
Speaker:
Apoorv Shukla
Type:
Project group meeting (Projektgruppentreffen, PGT)
Time:
07 March 2017
15:00 - 16:00
Place:
MAR 4.033
Abstract:
The operation of software-defined networks relies on a logically centralized controller, which is assumed to have a consistent view of the data plane. Providing such a consistent data plane view to the controller, however, is challenging: the data plane is subject to continuous changes for various reasons, and due to the decoupling of the control plane from the data plane, the former is not always notified about the events affecting the data plane configuration. This can result in reduced performance or even violations of security policies. This paper identifies and describes a number of scenarios leading to an incorrect view of the data plane at the controller. Motivated by these inconsistencies, we present a systematic approach, VeriTag, for finding inconsistencies in the data plane. VeriTag leverages a combined control and data plane methodology, systematically comparing the control plane expected with the data plane actual state. We show that our approach can detect important inconsistencies, such as misconfigurations, hidden flow rules, and software or hardware bugs, which are not covered by prior work. Using a prototype implementation, we demonstrate that our approach also comes with low overheads.

Tuesday, 28. February 2017

PGT by Balakrishnan Chandrasekaran
Speaker:
Balakrishnan Chandrasekaran
Type:
Project group meeting (Projektgruppentreffen, PGT)
Time:
28 February 2017
15:00 - 16:00
Place:
MAR 4.033

Tuesday, 07. February 2017

Masterstudent introductory talk by Sebastian Lohff
Speaker:
Sebastian Lohff
Type:
Masterstudent introductory talk
Time:
07 February 2017
15:00–16:30
Place:
MAR 4.033
Abstract:
 The Internet is one of the biggest communication networks in the world.  Inter-domain routing via BGP plays a big part in the success of the Internet.  But it is a hard topic to grasp and successfully implement without getting first-hand knowledge in operating a BGP-based network. This thesis presents a self-made testbed using off-the-shelf components to create an Internet-like infrastructure that aims to represent as many features of the real-world Internet as possible. The thesis describes how this testbed was created, what its goals are and what infrastructure and software were written to simulate different aspects of the Internet.  Services like DNS are also taken in consideration, resulting in a more holistic approach to fullfil the goal of recreating an Internet ''ecosystem''. Furthermore, to compare the testbed to its real couterpart, a set of attributes outlining the Internet are discussed and the testbed is evaluated within this context. Additionally the thesis provides a comparison to other inter-domain routing testbeds.

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