FrOSCon 13 Network Track – Videos and Slides

A month ago the 13th Free and Open Source Software Conference (FrOSCon) took place in St. Augustin, Germany.  At this years event I organized a two day Network Track designed for a broad audience of Linux folks, system administrators and developers to answer questions about networking topics they were afraid to ask or didn’t realize they wanted or had to know! As the lines between system engineering and network engineering keep on blurring it’s getting more and more important to broaden the focus in both worlds, keywords being things like SDN, IP-Fabric, Segment Routing etc. here.

The track started with a lecture about networking basics and over both days advanced to technically more sophisticated topics following a red line.

On Saturday the focus was on Layer 2 and Layer 3 fundamentals (Ethernet switching and routing), dynamic routing protocols as well as the Linux packet-filter. Sundays track started gently with VLANs, Bonding and Bridging and advanced to more sophisticated topics like policy-based routing, VRFs, Open vSwitch, Segment Routing and Software Defined Networking. The track concluded with an overview about Best Current Operational Practices and a Q&A sessions.

All these talks are – thanks to the nice folks at CCC-VOC – available on Video at (german audio) as are the slides (english):

Day 1

Day 2

  • Adv. topics in Layer2/3 – Light and dark magic with the Linux network stack  (Video) (Slides)
  • Segment Routing  (Video) (Slides)
  • Open vSwitch – The switch within your machine  (Video) (Slides)
  • Best Current Opertional Practices – Dos, Don’ts and lessons learned
    (Video) (Slides)
  • Building your own SDN – The penguin orchestrates the network  (Video) (Slides)
  • Grand Q&A  (Video)

GulaschProgrammierNacht 2018 – Awesome talks, fiber cuts and a lot of fun

As every year some weeks after the EasterHegg, the GulaschProgrammierNacht (GPN18) took place at  Hochschule für Gestaltung (HFG) and Zentrum für Kunst und Medien (ZKM) in Karlsruhe. It’s a four day event with a lot of lectures, workshops, Gulasch, a lounge and other amazing things; like any chaos event. As usual the C3VOC did an amazing job streaming and recording (nearly) all sessions!

CC-BY 4.0 by Flo Köhler


Awesome talks

The GPN had a huge programm with so many technical, cultural, social, … sessions. I would like to especially highlight Alles was ihr schon immer über Glasfasern wissen wolltet (de) by Marc & MomoModerne Kommandozeilen-Werkzeuge (de) Standards – Gut, dass so Viele zur Auswahl stehen (de) by Martin as well as One Brain, One Keyboard, One Editor (en) by Miro.

The network

At the NOC – as always – we had some fun with shiny hardware and running a 4,5 day conference ISP for fun and Tschunk. This year Juniper and Arista provided some nice boxes which made up the core of the GPN network. An Arista DCS-7280SR was the core and border router and connected the GPN18 to the world with 120Gbit/s, a Juniper QFX5100 distributed all that bandwidth within the building, which appeared to be a setup we might want to adopt for future GPNs. As it turns out Aristas Cisco-like CLI is not quite cisco, but better 🙂

As it happens, not everything went after plan and we have a major downtime in the middle of the night due to a fiber cut and a misconfiguration coming together – Murphy must have been at the GPN, too. We had built a 2x40Gb/s LAG with two redundant paths from core to distribution, but one interfaces was in 4x10G mode instead of 1x40G and therefor not part ofthe LAG (so check your ports kids!) and one fiber patch of the active path was taped to the wall and broken by accident. Luckily it was in the middle of the night.