Update 2008/11/17: Networkmanager is broken in intrepid. To get it working had to install network manager from ppa as given here - http://www.ubuntu-forums.com/showpost.php?s=e0d93c09b8c340976477456593ac4cf7&p=6094870&postcount=5
Ok - this was easy - and while there’s some resources on google, I had to figure out a few itty bitty things for my work VPN setup.
Restart network manager with
killall nm-appletsudo /etc/init.d/dbus restartnm-applet --sm-disable &
Configure VPN settings
Click on the network manager applet and click on VPN connections
Create a new VPN connection
Ensure that you select Refuse CHAP in the authentication tab.
In the routing tab, you can give netmasks that need to go through VPN - for my work network, I have: 10.10.5.0/24 172.16.106.0/24
That’s it. Now click on the Network applet, and connect to your VPN. In the authentication dialog, use <domain>\username and your windows domain password.