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.
Mac OS X 10.x
To use VPN on Mac OS X 10.x, you don't need any special software (e.g. Cisco VPN Client). Follow the instructions on the following page to set up your VPN connection: VPN on Mac OS X 10.x.
The required software "VPN 5.x" (Cisco AnyConnect) can be downloaded from https://ides.ethz.ch
Windows 7 - Detailed Instructions
Use this illustrated guide for obtaining and installing the required software if you are unsure:
Self-managed Linux Workstations
Clients running Gnome