Network restructuring on the weekend of November 25th and 26th, 2023.

Next Saturday and Sunday, we finally have the long-awaited network restructuring happening.

These changes are necessary to improve the performance and reliability of our network.

To minimise the impact on you, we’ve planned to carry out the restructuring early in the day. During these times, there are usually fewer users online, which should reduce any inconvenience.

The scheduled offline periods will each last about an hour. We understand that this may be a bit inconvenient temporarily, but we are confident that the long-term benefits will outweigh any short-term inconveniences.

We appreciate your understanding in advance.

Update Nov 25th 2023 4:15 PM:

Yesterday, Malte worked until 11:30 PM, and Lucas until 1:00 AM, preparing and configuring.

The implementation of network changes started this morning at 10:00 AM and resulted in a longer network interruption across the entire network (student housing and dormitories) at 10:30 AM.

The interruption lasted from 11:30 AM to 2:00 PM and then from 2:30 PM to 3:30 PM. The work was completed by 3:30 PM, and the last device came back online at 4:00 PM.

During the cleanup following the work, no further outages are expected.

Whether work will be needed again on Sunday depends on whether disruptions are reported to us or if we discover issues that are not functioning as desired.

November 2023 Welfenstrasse

The internet at Welfenstrasse 80 is not working right now.

We first heard about this issue on November 11, 2023, after 10 PM, but the information was not very clear at first.

After checking the wireless bridge from a distance and ruling out other possible causes, we hope it’s just a loose mount on the bridge.

But, we are worried that we might need to replace it.

Just to be safe, we are sending a request today for a replacement to StuWe.

All checking and fixing work depends on the weather, because we need to go on the roof to do it.

So, we are hoping for better weather tomorrow to check the hardware in person.

As always, please report right away if something isn’t working. Describe the problem and what kind of tech you are using. We already know how important the internet is, so you don’t need to mention that. Just tick the box if you feel like saying that.

Update Tuesday 14.11.2023 6:30 pm:

In the morning, it became clear that there would be a long break in the rain, which might allow us to work on the roof in Hohenheim. That’s why we decided to have a meeting during lunch break. One of us, who was professionally near Hohenheim, was able to be on the roof in Egilolfstraße during the conversation and check the antenna there and its alignment.

Originally, we thought that the antennas had reached the end of their life and needed to be completely replaced. Getting new ones would probably have been possible by the end of the week, but in the meantime, the poor internet connection would remain. Therefore, we came up with the idea to dismantle a part of a radio bridge, which was used as a test setup, from another roof and replace it in Hohenheim today. Right after the meeting, we implemented this and around 16:50, we were able to replace the antenna on Welfenstraße, which was responsible for the disturbance. After some driving and a bit of traffic, I am now here dictating this text, which I will have ChatGPT format before I leave for the evening.

We hope that the system is now working again and plan to create redundancy soon. This way, if this pair of antennas fails, it can automatically switch to a better system.

Of course, we would prefer to have a fiber optic connection to you, as we usually do, but that seems difficult.

Update 15.11.2023, 7:30 pm:

A new day, a new attempt! Unfortunately, the exchange in Welfenstraße yesterday was not successful. Therefore, we have now placed the antenna that we had removed there on Egilolfstraße and thus swapped everything once.

Currently, there are no new outages to report, and we hope to gain some time to decide on 2 more antenna pairs. These should then be able to function in continuous operation as redundancy for several years.

Once you are in Hohenheim, such an exchange is quickly completed. The travel time alone today was approximately 3 hours.

Update 16.11.2023, 8:15 am:

Now sign of a problem since the exchange, but also no feedback from anyone who lives there.

WiFi vs Internet

Sadly, we often hear the following two statements:

It can’t be the router settings because my Wi-Fi is working.


Here’s a photo of my working Wi-Fi connection, so my internet must be broken.

The root of the issue seems to be that people don’t understand the difference between Wi-Fi and internet access.

Here are three examples that could explain the difference to you.

Imagine your home is like a big library (which represents the internet). The librarian (your router) helps you find and borrow books (data). You and your family members can chat with the librarian using walkie-talkies (this is your Wi-Fi connection).

Now, even if the librarian’s walkie-talkie is working fine and you can talk to them (you have a Wi-Fi connection), the library might be closed or inaccessible (internet connection is down).

So, having a working walkie-talkie (Wi-Fi) doesn’t necessarily mean the library (internet) is open. The two are related, but different!


Imagine your Wi-Fi router is like a post office in your home. All your devices (like phones, laptops, and TVs) send and receive messages through this post office. Now, just because the post office is open (meaning your devices are connected to the router), it doesn’t necessarily mean it can send or receive mail to and from the outside world.

The Internet connection is like the trucks that come and go from the post office to other places. If there are no trucks coming in or going out (meaning no Internet connection), then your post office can’t actually send or receive any mail beyond your home. Your devices can still “talk” to each other within the home, like sending files or printing, but they can’t access anything from the wider world like websites or online games.


Having a Wi-Fi connection to a router is like being connected to the switchboard inside your house. You can talk to other devices in your home, like your smartphone talking to a smart TV. But that doesn’t mean the switchboard is connected to the outside world.

The router has another job: it needs to connect to the internet, which is like connecting your home switchboard to the big phone network outside. If that connection is missing or not working, you won’t be able to browse the web, watch online videos, or do anything else that needs the internet, even if you’re still connected to the router via Wi-Fi.

So, Wi-Fi connection to the router is just the first step. The router itself also needs to be connected to the internet for you to do most of the things you want to do online.

Welfenstrasse Sept 2023

We currently think that the radio bridge might have a problem. To check this, we need to go to Hohenheim and climb onto the roof of Egilolfstrasse.

Today at 2:50 PM, we restarted the hardware and are now monitoring the transmission values. We hope the issue is due to the current weather, as the weather and our availability don’t match the necessary work.

Please let us know in the next few days about your experiences with the internet connection so far.

Schimpf-Eck (Am Lustnauer Tor 1) September

The rooms at Schimpf Eck (at Lustnauer Tor 1) now all have network sockets!

The only thing left to connect you to the dorm’s fiber-optic network is to lay down the fiber-optic cables. We’ll figure out who’s doing it and how it’s done. In the meantime, there’s a wireless connection.

The construction work for a proper wireless operation should be finished in November. Until then, we have a temporary solution for you.

We are working on getting everything done in September, so you can have some internet by the time the semester starts.

New in the dorm?!

Welcome to the dorm! It’s great you’re here.

If you’re wondering about the internet, don’t worry, it’s really easy! In your room, you’ll find a wall socket that gives you direct internet access. Prefer WiFi? No problem! You can easily set up your own WiFi router.

If you don’t have a router yet, you can get one for around 35 euros. We even have a list of routers that work well here. However, we don’t recommend any specific brand or model. Just a quick tip: FritzBoxes are not the best choice, and there’s really no need to spend more than 50 euros on a router.

If you ever run into a problem or need help, don’t hesitate to write to us using the contact form. Please always use this form so we get all the info we need to help you quickly and efficiently.

Have fun and enjoy your time in the dorm!

Your volunteers of the Netz-AK (short for Netzwerk Arbeitskreis = Network Work-group)

lightning strike Provenceweg 7/9

According to yesterday’s diagnosis, it seems that a lightning strike damaged some chips on the switches in the basement.

We are currently setting up the configuration on the new switches.

Afterwards, we will install the switches in Provenceweg. This will cause a brief network outage, as we will have the cables in hand.

We won’t be able to respond to emails in the basement. If you have any questions about the duration, come visit us in the basement at number 9 (towards the center of the building).

Update 12:30 PM: Everything has been swapped out and upgraded from 100 Mbit/s to Gigabit. Feel free to run our speed test and let us know if something still isn’t working.

Schimpf-Eck (Am Lustnauer Tor 1) July2023

Surprisingly, construction work for Schimpf started last week. Each room, as usual in our dormitories, will have its own network connection with a double network socket, and one connection will be active.

We don’t consider a comprehensive alternative like WLAN networking, which is often desired, to be practical here. Those who have dealt with connecting hundreds of devices to Eduroam will understand why we are avoiding it.

In each room, you can set up your own secure and easy-to-configure WLAN with a simple router for around €35, allowing you to connect everything from a printer to a PlayStation.

The connection of the WG units in Schimpf Eck depends on the work at Pfleghof, whose starting date is still unknown to us. As surprises are possible, we prefer not to estimate when it will be ready. Getting new DSL contracts doesn’t seem sensible to us. We hope that the WG units will find a fair solution to redistribute the internet access costs or find a way to get rid of these contracts once the dormitory is stably connected to our network.

The final connection via fiber optic to our network is planned but not yet confirmed.