To use your computer within the ETH network or to use wireless LAN you have to establish a VPN (Virtual Private Network) connection first.
On this page you can find instructions how to use this service at ETH (open the pane "Instructions / FAQ / How-To" on that page).
To use VPN on Mac OSX, follow the instructions on the following page to set up your VPN connection: VPN on Mac OS X.
Navigate to the ETHZ IT Shop. After authentication, go to "Service Catalog", then to the section "Software and Business Applications", and click in the subsection "Software and Licenses". Click "Order software product". In the search field enter "VPN", then choose (select) the "VPN Client Cisco" for your operating system. The VPN client download instructions can then be found in the "My Products" menu on the left screen side.
Windows 10 - detailed installation and configuration instructions
Use this illustrated guide for obtaining and installing the required software if you are unsure:
Self-managed Linux Workstations
Clients running Gnome or KDE
Download following PDF from ID ETH [UbuntuKubuntuVPN