Configuring the IoA VPN is the same process as University VPN but with a single change to the instructions as documented below. If the provided download links are broken, try looking for the missing file on the UIS Managed VPN page.
Follow the instructions for your version of windows and replace the hostname provided by the UIS documentation with vpn.ast.cam.ac.uk
There are UIS instructions for 3 Ubuntu LTS versions. If you are using another Linux distribution the generic instructions and Ubuntu instructions should provide enough information to set up the University and IoA VPNs.
For Ubuntu 20.04, 18.04 and 16.04, follow the UIS instructions with but the following changes
sudo wget -O /etc/ipsec.d/certs/ast-vpn.crt https://help.uis.cam.ac.uk/system/files/documents/ast-vpn.crt
Start the VPN and check it is by reloading this page. Make sure your IP address is shown as 172.16.43.x (where x is a number between 0 and 255).
Your current IP address is 3.238.118.27
Please note that when connected to the IoA VPN, all network traffic from your device flows through the VPN server whether it is destined for the IoA systems or the wider Internet.
In normal use, this is not an issue but if you aren't needing to access IoA systems requiring the VPN (eg NoMachine servers) please turn off the VPN to free up bandwidth.