Connect to wlan via vpn under Ubuntu 9.04

<p>To connect to the internet via vpn and wlan you first have to get an ip address from the wlan accesspoint. After this you can build up the vpn tunnel and register yourself in one step. This is safe and comfortable if you are working at your workplace. With Windows XP (SP3) this works without problems.</p><p>But when I use Ubuntu 9.04 I cannot connect to the server to register. On the TU I can only receive an ip address, open a browser an type my username and password in the login-field. This does not seem to be very secure due to the fact that the connection is not encrypted when sending this information. Interestingly the connection from home to the vpn-server (which has another ip than the first one) works fine without problems.</p>