Blog | Selfnet e.V.

2024

Education at the Chaos Communication Congress

A look back at 38C3 and Selfnet's participation
Post mortem of outages 2024-09-14 to 16

Post mortem of the network outages from September 14th to 16th

2023

Wi-Fi 7 field tests

Selfnet e.V. has tested Wi-Fi 7 in its network environment. This article provides insights into the test setup and the results.

2022

Migrating our DHCP Server to Kea

We migrated our DHCP Server from ISC DHCP to Kea. Here you can find out how we did it.
New Switches needs our LAN(d)

We are currently testing new access switches for our network.

2021

Introducing the "Selfnet Network Map"

Our network map is now public. It shows the current situation in our (internal) network.

2020

Why is the WiFi reception not as good as it should be?

Tips on how to improve the WiFi reception in your dormitory.
How to DOS yourself

A story about how we managed to DDoS ourself
Tale of the JuRIPer-Bug

A story about a bug in Juniper routers that caused our network to break down.
No office hours because of coronavirus pandemic (COVID-19)

We deeply care about your health. For this reason, we have reduced office hours.

2019

Outage RFO for September 6th/7th, 2019

Reason For Outage (RFO) for the Selfnet core network outage on September 6th/7th, 2019.
Invitation to our general meeting of 2019
How a spam mail led to CVE-2018-18898

Debugging a high CPU load on our ticketing system led to a security fix in Email::Address::List

2018

The Selfnet Firewalls and their Limits

Analysis of the performance issues of the Selfnet firewalls and possible solutions
Connecting Studentendorf Ludwigsburg and Future

The dormitories in Montessoriweg, Pestalozziweg, Peter-Eichert-Str. and the dormitory of the Finanzen are now connected via fiber!
State of the connection Studentendorf Ludwigsburg and Wohnhaus der Finanzen
Connected In der Au to the dormitory-network

Last Saturday we connected the In der Au dormitory to the dormitory-network.
Connected Anna-Herrigel-Haus to the dormitory-network

Last Friday we connected the Anna-Herrigel-Haus to the dormitory-network.
Invitation to our general meeting of 2018
Data protection and privacy at Selfnet e.V.

Some of you might wonder how we collect and handle the personally identifiable information we have about our members. In this blog post we will try to give you a bit of insight into that topic.

2017

Expansion of the Selfnet network in the Stuttgart city center (Part II)
SelfStreaming Photo Story

A photo story about self-streaming
Storage failure

What went wrong with our storage cluster
Network Debugging: Rogue Router Advertisements

How we debugged and fixed a problem with rogue router advertisements
Expansion of the Selfnet network in the city of Stuttgart (Part I)
Ceph storage upgrade post mortem

What went wrong during the Ceph storage upgrade

2015

Plastikonf, dumping the flash

Dumping the flash of a new router model
Graphing interface errors with M R T G

How to graph interface errors with MRTG
Plastikonf, new routers, new problems

Reverse engineering the crypto of a new router model
Plastikonf

Unser Tool zur automatischen Konfiguration von Routern

2014

The "P" in "SEPA" is for Pain

A small and cynical look behind the scenes of our first SEPA mass direct debit.

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