Visitors to LinuxDays to see an Optical Lab

Prague 2 October 2015. Five experts from the CESNET association will contribute with their presentations during the programme of this year’s fourth open conference LinuxDays, which will take place on Saturday 10 and Sunday 11 October in the FIT ČVUT building in Prague-Dejvice. CESNET is a partner of the event. CESNET will, along with the presentations of its representatives, also present its own stand, where visitors will see how optical networks work. CESNET will also permit visitors to enter the optical lab and the SAGElab.

The guests can have a look at an exhibition of optical network components in the Association’s booth: optical fibres, connecting fibres, transceivers, active components with optical transceivers, and elementary diagnostic tools such as red laser and optical performance gauge. The exhibition will also include a functional simple network connection.

The booth will also feature an example of application protocol processing at 100 Gbps. The example documents one of the current trends: growing network link bitrates and complexity of application protocols increase the need for high-speed and accurate network monitoring. As a response to this challenge, CESNET has designed a concept of hardware acceleration of flexible network flow metering known as the SDM (Software Defined Monitoring). Application protocols are processed in software in cooperation with a configurable hardware accelerator.

The example will demonstrate real-time HTTP traffic analysis at 100 Gbps in a network using an SDM implementation on a COMBO-100G card. This is the world’s first PCI Express card with a 100 Gbps Ethernet interface capable of full interception of all traffic in the RAM. The example will show results of the HTTP analysis, CPU load diagrams, and the amount of traffic processed.

As part of the LinuxDays, CESNET will also offer a guided tour of the optical laboratory, which houses an experimental optical route of 2 x 300 km equipped with CzechLight amplifiers and CL-OpenDWDM technology. This will enable visitors to see a real-world functional transmission route. The tour will include an explanation of the principle and functioning of the component equipments, issues of long-distance data transmission, and the wave multiplex principle. Visitors will also see more complex metering devices and an illustration of basic metering.

The conference attendees will also have access to the SAGElab laboratory, a common workplace of the CESNET association, FIT ČVUT and FEL ČVUT. It is dominated by a state-of-the art video wall, providing resolution exceeding 8K. The lab supports the education of experts in the fields of network technologies, multimedia and virtual reality, and creates an environment for research and development of new network application (more at:

LinuxDays is a Czech Linux conference. It was held for the first time in 2012, when it replaced the earlier LinuxExpo conference. In four years LinuxDays became an independent event, one of the largest of its kind in the Czech Republic. This year the visitors can choose from among fifty lectures, divided into eight thematic sections, and also seven workshops.

Find the detailed programme at: You can register at the same address as well; entrance is free:

What will the CESNET experts talk about?

Saturday 10 October 2015

Tomáš Čejka: Network Measurements Analysis
During the lecture the visitors will learn about the academic project Nemea, created in cooperation with Czech universities (ČVUT, MU, VUT) and the CESNET association. Nemea is an open-source system for the analysis of network flows and detection of anomalies.

Lukáš Macura: Beesip and uciprov – automation of device deploying
The lecture will describe the possibilities of Beesip, OpenWrt and Uciprov, including the connection to Zabbix monitoring. The result is an automated central administration in different parts of a network.

Sunday 11 October 2015

Ondřej Caletka: Let’s encrypt – ACME, certificates mill
Encryption requires proof of identity. TLS certificates are used for this purpose, acquisition of which is human-labour intensive and frequently also costly. But this should change this year. The ACME protocol should replace all manual labour associated with identity proving and enable acquisition of a reliable certificate by several commands. More during the lecture.

Pavel Kácha: Warden: Efficient sharing of information on security events
A secure network includes monitoring of security events and anomalies and responses to it – either from logs, honeypots, netflow or hardware probes. Most data from detection devices remains unused, even though it could be a valuable source of information. That is why CESNET developed Warden – a system for automated sharing of the information between security teams.

Michal Strnad: ownCloud under the hood
The lecture will present the ownCloud, open source solution for automated synchronization of data between computers and mobile devices, running on diverse platforms. The great advantage is the openness of the source code and possibility of operation on your servers and the associated maximum control over your data.

The CESNET Association was founded by Czech universities and the Academy of Sciences of the Czech Republic in 1996. It is engaged in research and development in information and communication technologies and builds and develops the CESNET national e-infrastructure for research and education. With its research activities and accomplishments, CESNET represents the Czech Republic in international projects, most notably the pan-European GÉANT network building project and grid projects (, and participates actively in their implementation.

Last change: 5.10.2015