Using Eduroam with GNU/Linux

This page describes the procedure of how to get wireless networking running within the (topological) boundaries of Ohm-Hochschule Nürnberg using Eduroam.


To get wireless networking running on GNU/Linux you need:

  • A portable computer equipped with a WLAN NIC.
  • A GNU/Linux operating system, such as the one provided by the Ohm/efi-stick.
  • A network setup that has dynamic host configuration enabled. Otherwise the following instructions won’t work.
  • A connection to Eduroam, such as the one emitted throughout the covered WiFi-area of Ohm-Hochschule Nürnberg.
  • All data of your My.OHM-account.
  • The root certificate of Deutsche Telekom.

Retrieving the Telekom Root Certificate

All items but the last one should be self-explanatory. As far as the certificate is concerned, it is probably already installed in your filesystem. If you have installed a Mozilla-compatible web browser, your system-wide certificates can be found in


This directory may or may not contain further directories to break down a long list of files into specific categories. Using a shell, you may want to try to locate the certificate via

find /usr/share/ca-certificates -name \*elekom\*

If the certificate is not installed on your system, you can download it here, and save it for later use. However, note that you need access to the internet to do so.

Regardless of the method of retrieval, take a mental note of where the file is located. It represents the aforementioned certificate and is required later.

Scanning the Network

Wireless networks
  • Having booted into your graphical desktop, click the Wifi widget to get a list of detected wireless networks.
  • You should see eduroam and OHMnet somewhere among the listed networks. Note that these networks are accessible only in designates areas of the campus.
  • Click eduroam. This should invoke your Connection Manager. If it doesn’t, select System → Preferences → Network Connection from your main menu.
  • Select tab Wireless, if it isn’t already selected.
  • If eduroam is in the list of network, select it and click Edit. Otherwise, click Add. In both cases, another window opens. However, the following section applies only to creating a new connection via ‟Add”.

Creating a New Connection

Network Connections
  • Choose a Connection name on the top of the window.
  • Select tab Wireless.
  • Set the SSID to eduroam.
  • Set Mode to infrastructure.
  • Set the MTU to automatic.

Security Settings

The following steps apply to ‟Add” as well as ‟Edit”.

Security settings
  • Select tab Wireless Security.
  • Set Security to WPA & WPA2 Enterprise.
  • Set Authentication to Tunneled TLS.
  • Leave Anonymous identity blank.
  • Click on the button next to CA certificate. This opens a file requester that allows you to choose the file of the certificate you located above.
  • Set Inner authentication to PAP.
  • Set Username to your My.OHM-username followed by @ohm-hochschule.de, for example muellerli12345@ohm-hochschule.de.
  • Enter your My.OHM-password next to Password.
  • Tick Ask for this password every time if you want to be prompted for your password every time you use the wireless service. Otherwise, leave it unticked to save your password along with the other parameters.
  • Click Apply to close the parameter window.
  • Back in the list of configured networks, click Close to close the Network Connections window.

Congratulations! You have configured your Eduroam connection.

Connecting to the Internet

  • Click eduroam in the list of accessible networks offered by the WiFi-widget to connect to the internet.

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