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Technische Universität München

Setting up a VPN connection to a Chair in the Informatics /Mathematics Department

1. General

1.1 Activation and configuration file

A VPN is available for each chair (as well as service offices etc.). However, the VPN must first be set up with the cooperation of the Chair admin or IT supervisor. If you want to get VPN access, please contact your Chair admin or IT supervisor. These are ultimately also responsible for the configuration, RBG only takes over the operation and consultation.

The Access must be activated for each user by the chair admin, the configuration file will be find here.

Please note: A connection to the VPN can only be established from outside the respective chair network (for example the networks which are configured in the VPN). On the one hand, since a connection would create double routes, and the VPN usually uses a UDP connection and UDP is completely blocked in most networks.

The VPN does not allow a direct connection to the Internet. Under Windows, access to the Internet should be possible via the direct network connection of the computer; under Linux, either the web proxy (proxy.in.tum.de) can be used or the routing table must be set so that the VPN is only used for routes provided by the VPN (no default route to the VPN).

1.2 Login and password

Login: RBG account (e.g. kahraman)
password: RBG password

1.3 Required Software

On the Mac we recommend Tunnelblick:

macOS: tunnel vision

Otherwise the software openvpn-client must be downloaded and installed:

Windows: Link für Windows

Ubuntu: sudo apt-get install openvpn

2. Windows:

Install the OpenVPN-Client software that can be found here:: https://openvpn.net/community-downloads/

Start the installer:

OpenVPNinstallWindows.png

Copy the OVPN-file (as described here) ito the config folder. Usually ist is to be found here: C:\Program Files\OpenVPN\config

OpenVPNWindowsConfig.png

Launch the VPN-client via the desktop icon. (it may already been launched, which will result in a corresponding message).

OpenVPNwindowsIcon.png

Right click the OpenVPN Icon on the task bar and choose connect

OpenVPNWindwosConnect.png

Enter your credentials (without @in.tum.de or @ma.tum.de)

OpenVPNwindowsLogin.png

Your connection should be established now, as indicated by a green OpenVPN icon in the task bar.

Screenshot 2020-03-20 at 13.48.37.png

3. macOS:

If not already done, install Tunnelblick (see above). Open the configuration file with a double click or with the right mouse button as below.
mac1.png
Then enter the RBG ID (without @in.tum.de or without @ma.tum.de) and the RBG password in the appearing window and click on "OK".

mac2.png
A tunnel symbol appears in the upper right corner when the program is started. First click on the symbol on the right and then select "connect". Then the connection to the university via VPN is established.

mac3.png

When the connection is established, the Tunnelblick icon is white as shown in the screenshot below.

Screenshot 2020-03-20 at 13.53.25.png

4. Linux:

Save the configuration file, e.g. to the Home folder.
In the terminal, go to this directory and execute this command : sudo openvpn Configuration file, e.g. for group XXX:
 sudo openvpn vpnxxx.ovpn   
Then enter the RBG ID (without @in.tum.de or without @ma.tum.de) and the RBG password.

4.1 Import VPN profile into networkmanager

The RBG VPN profile can be imported either via the Gui or via the command line.

4.1.1 Via the GUI tool nm-connection-editor:

Right-click on the nm applet and click on Edit connections : Then choose Add and then Import a saved one VPN configuration.

4.1.2 Via the terminal:

Enter the following command in the terminal: nmcli connection import type openvpn file ~ / vpn-rbg-standard.ovpn

4.2 Posible Problems

It is possible, that openvpn has problems with Ubuntu.
The Problem is that in the networkmanager from the openvpn plugin in the settingspage this thing has to be activated: ''Use this connection only for resources on its network''. When activated there is no possible defaultgateway. Although the RBG VPN has no defaultgateway, thinks the networkmanager, that there is one and so is the problem losed

vpnipv4.jpg.png

The same has to be done for the IPv6 Settings.

vpnipv6.png

5. Special cases

5.1 Multiple VPNs

In Windows with multiple simultaneous OpenVPN a connections another TAP device must be added.

Windows 7:
  • add "hdwwiz.exe" (Add Hardware Wizard) to be able to add a new hardware component.
  • Manually select the hardware from the list (advanced setting), leave the settings at "Show all components", click on "Installation media available"
  • The path for the driver is: C:\Program Files\TAP-Windows\driver
  • TAP-Windows Select Adapter V9
all Windows versions:

Run the following in an administrator shell: | C:\Program Files\TAP-Windows\bin\tapinstall install C:\Program Files\TAP-Windows\driver\OemVista.inf tap0901 |.

Topic attachments
I Attachment Action Size Date Who Comment
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connectopenvpn.pngpng connectopenvpn.png manage 176 K 16 Apr 2020 - 14:31 AyseguelOmusNe63guq  
mac1.pngpng mac1.png manage 23 K 11 Dec 2019 - 15:28 DianaAlInayaGa58kix  
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RBG_VPN.lnklnk RBG_VPN.lnk manage 1 K 22 Nov 2016 - 12:05 HenrikNoackNe24yev Link to start the VPNGUI-Script
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VPNGUI.ps1ps1 VPNGUI.ps1 manage 4 K 22 Nov 2016 - 12:00 HenrikNoackNe24yev Script to access the VPN-Service an non-admin user
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Topic revision: r29 - 20 Apr 2020, AyseguelOmusNe63guq
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