Tutorials

Using OHMnet with GNU/Linux

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

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

Receiving the Installer Package

  • Connect to OHMnet. OHMnet is available in most rooms of the Keßlerplatz complex (KA-site), as well as most lecture halls and public computer laboratories in Wassertorstraße (W*-site). Browse the wireless network for OHMnet. OHMnet is an unencrypted network. Avoid any other networks with similar names, such as “OHMnet+”, or encrypted variants. Being an unencrypted, “public” network, OHMnet does not ask you for any password or key.
  • Direct your browser to https://vpnssl3.cs.fh-nuernberg.de
    This is one of the few sites that OHMnet allows you to connect to — at least at this stage. Access to other network entities, web addresses as well as other network services, is only permitted by means of the VPN. The rest of this document is therefore dedicated to explaining how to install the necessary software to connect to the VPN.
  • Once the web page finished loading, select my.OHM as the authentication method and click Next.
  • Enter your My.OHM username and password in the form. Click Log in.
  • Next comes an overview of all available network components. The only important package should be Install Connect Tunnel. Click the respective link.
  • It might take the software server some time to respond, but sooner or later you should receive a notification that the download of a file has started.
  • Once the download process finished, you don’t need the software server any longer and should click Log out to terminate the connection.

Installing the Software

  • The file you received is a tar archive, and must be extracted. To do so, open a shell.
  • Navigate to the directory that contains the downloaded file. Most commonly, the downloaded file will reside in the Downloads directory, which, in turn, is found in your home directory. To move there, type
    cd ~/Downloads
    
  • To extract the archive, type
    tar xf File.tar
    
    where File stands for the actual file name.
  • Once the extraction is finished, type
    sudo su
    
    to become a superuser (administrator). You will be prompted for the superuser password. Enter it.
  • As an indicator that you wield superuser privileges, most shells replace the prompt by an “#”.
  • Type
./install.sh
to initiate the installation process.
  • Once the installation process has finished, you don’t need superuser privileges any longer and should abandon them to avoid accidental trouble. To do so, press ^D, that is, hold down the Ctrl/Strg key and press “D”. Your user status (and with it, your shell) should be back to normal.

Configuring the VPN-Tunnel

  • Still inside the shell, type
    startctui
    
    to start the graphical user interface of the Connect Tunnel. If you receive any warning about your JRE having an incorrect version, try saying “y” (“[y]es to ignore”) here.

OHMnet settings
  • Click Edit/Add configuration.
  • Enter
    • A name for the new configuration, such as “OHMnet”
    • Server name: vpnssl3.cs.fh-nuernberg.de
    • Username: your My.OHM username
    • Password: your My.OHM password
  • Click Save/Apply/Close. The name of the newly created configuration should appear in the list of configurations on the left-hand side.

Connecting to the Network

To be able to connect to the network

  • Connect to OHMnet, if you haven’t already done so before. Note that you have to do this before establishing the VPN-connection.
  • Run the startctui tool, either by typing
startctui
in the shell, or by creating an additional entry in one of the application menus of your desktop environment.
  • Once you see the window of the Aventail Connect Tunnel software, select your configuration and click Connect.
  • After that, you will be able to connect to the internet.


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