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Optimize wireless controller settings

The following settings for your wireless network interface controller (wnic) can help to improve your wireless connection:

Choose your wnic depending on your operating system and adjust the following settings:

  • For settings with 802.11 the highest possible version needs to be enabled, that is n<g<b<a.
  • If the controller offers the choice of 2.4 and 5 GHz, prioritize 5 GHz.
  • Protection for mixed networks should be set to CTS to self.
  • Keep dynamic roaming at medium or try highest level.
  • Choose maximum transmission capacity.

This certificate is already installed as a certificate authority.

"Dieses Zertifikat ist bereits als Zertifizierungsstelle installiert".

"This certificate is already installed as a certificate authority".

If you see one of the above messages, it is likely that your browser tried to install a certificate.

This is neither required nor desirable for using the WLAN. All required certificates need to be installed for your operating system. Download the relevant certificate file to your computer (right-click on the file, "save target as..." in the pop-up menu) and install the certificate (double-click on the downloaded file, "install certificate...", "Next", "Next", "Finish").

Win 7: Balloon tips are not displayed

If you cannot see the balloon tip in the lower right corner, the reason could be that this function is deactivated in your system.

To activate balloon tips, carry out the following steps: Press the "Windows Start Key" and "R", in the text field enter "gpedit.msc" and click "OK".

In the Group Policy Editor (GPEdit) select the path "User Configuration > Administrative Templates > Start Menu and Taskbar"

Set the key "Remove Balloon Tips on Start Menu Items" to "Disabled" or "Not configured" and click "OK".

Connection problems with SiS163u WLAN cards

Unfortunately, you cannot connect to eduroam with SiS163u WLAN cards, as they do not fully support the 802.1x protocol. The only solution is to change your WLAN card or to use a USB WLAN stick.

Problems under Android 3.0

It is not possible to establish a connection to the eduroam network with Android 3.0 by selecting eduroam from the list of detected networks.

A workaround is to manually create a new connection using the SSID "eduroam".

Then follow the standard process and instructions for Android operating systems.

Certificate installation under Linux

The following steps describe how to install a certificate under Linux.


All following steps have to be carried out as roots in the terminal.


Carry out the following steps to install the certificate:


Download the certificate:

wget www.tubit.tu-berlin.de/fileadmin/a40000000/tubIT/Trustcenter/TU-Berlin_Zertifikatkette.pem


Create a subfolder in the certiface folder:

mkdir -p /usr/share/ca-certificates/tu-berlin.de


Move the certificate to the corresponding system folder:

mv TU-Berlin_Zertifikatkette.pem /usr/share/ca-certificates/tu-berlin.de/TU-Berlin_Zertifikatkette.pem


Add root certificates to the SSL certificate data base:

echo tu-berlin.de/TU-Berlin_Zertifikatkette.pem >> /etc/ca-certificates.conf


Update the certificate data base:



These instructions have been written for Ubuntu Linux Version 10.04 "Lucid Lynx". The instructions may differ for other Linux versions.

Note: If you carry out these commands with "sudo", the echo line should read as follows:

sudo echo tu-berlin.de/TU-Berlin_Zertifikatkette.pem >> sudo tee /etc/ca-certificates.conf

Can I use the WLAN also with devices that are not described in the instructions?

No, only those operating systems listed at Zugang und Anleitungen are supported. Certain devices, as e.g. iPhone (Firmware 1.x), Google G1, Nintendo DS, Sony Playstation, various Sony Ericsson mobile phones, Blackberry etc., do not support the required IEEE802.1X standard (EAP-PEAP or EAP-TTLS with PAP authentication). Any questions addressing this issue will not be answered.

What is the network name (ESSID)?

Please use the network name "eduroam" or "TU-Berlin_802.1X" for direct authentication.

(ESSID - Extended Service Set Identity) 

How many devices can be simultaneously connected with the WiFi?

You can be logged in with up to four devices in eduroam.

Is there any health risk involved in using the WLAN?

In 2001, the Nova Institute for Ecology and Innovation carried out an expertise on behalf of the University of Bremen. The outcome was that there is no health risk involved. The highest values measured were at 0.025% of the maximum value stipulated by law. The WLAN facilities of TU Berlin are comparable to the experimental set-up used at the University of Bremen. You can download the complete expertise here.

What speed can be reached with the WLAN?

We offer speeds of 2.4 GHz (802.11g) and 5 GHz (802.11a/n) with a bit rate of up to 54 MBit each for all areas. In areas with a constantly high data transfer volume, we upgrade the facilities to (Draft-)N 2.0 so that rates up to 300 MBit can be reached. The rate that can be used realistically however, reaches 50% of the signal's rate due to protocol overhead, error correction etc. These rates of 25 or 125 MBit have to be shared by all users of the same access point. The 5 GHz band (802.11a/n) is currently not so much in use so that higher rates might be available. We therefore recommend all users to prefer this band as long as their consumer device supports this standard.


Please note: Speeds above 54MBit/s always require WPA2 encryption with AES (802.11n standard). With WPA1 and TKIP you can reach max. 54MBit/s everywhere.

What is the IP address range for the WLAN?

Currently, the IP address range that is (automatically) provided for the WLAN is:

  • from to (

However, we cannot guarantee these addresses to be valid for all times.


Visitors of TU Berlin, e.g. guest researchers, can access the tubIT WLAN with the account provided by their home university if the home university belongs to the eduroam alliance, as does TU Berlin. Please see the instructions of your home university to configure your eduroam connection.




TU Berlin offers the possibility to access the service by using an eduroam identification. Please enter “account name@institution.domain” during the authentication. Please visit the pages of the German eduroam or for foreign institutions the pages of www.eduroam.countrydomain to see whether your institution is part of the eduroam alliance.

Users who have a tubIT Account with a valid WLAN access right can use the roaming function at other places by logging in with their tubIT account name@win.tu-berlin.de and their password. Please refer to the web pages of the institution abroad to find out which method is required to log in (IEEE802.1X, WebRedirect, WebVPN etc.). To do so, click your way through the website of e.g. www.eduroam.fr for France to find the relevant institution.




eduroam users from different institutions

If you want to use the eduroam with the account from your institution:

  • the username needs to be entered as: <username>@<your-institution>.<de>, log in through username only is not possible
  • please make sure, that the verification of the certificates is activated in order to submit your username and password in an encrypted form



For further information, please refer to the hotline, to tubIT Info or send an e-mail to wlan@tubit.tu-berlin.de.

To be able to help you as fast as possible please be prepared to give a detailed description of how a problem occurred and answer the following questions:

  • What operating system are you using?
  • What SSID are you using?
  • What was the last access point you were connected to?
  • Did you get an IP address? If so, which one?
  • At what time exactly did your problem occur?
  • Do you use the client software that is offered on our web pages? If so, which one?
  • Are you using a firewall?
  • Are you asked to enter your user name password when you are trying to connect to the network?
  • What is your user name?


Please make sure to keep your operating system and software up to date and to use the latest drivers for your WLAN card!

Zusatzinformationen / Extras

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