(Tested on Manjaro, Ubuntu 18.04, Ubuntu 20.04)
Our school uses the L2TP/IPsec with PSK protocol, and I've read plenty of stackexchage and forum posts regarding issues with setting up L2TP/IPsec on a Linux system. After many trials and errors I managed to set it up, and helped friends and colleagues who use Linux as their PC. I haven't shared or replied to any threads about the solution I found, primarily because I don't really know why the other methods didn't work and why this setting in particular works 🤷 So here we go.
I am going to set this up with the GUI Networkmanger, which should be installed on your MANJARO distro by default, if not, run
sudo pacman -S NetworkManager
Next, open up your Networkmanager by Systems Settings > Network - Connections
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Click (+) and select Cisco compatible VPN (vpnc)
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Fill in the following information:
Connection name: CUHK VPN (or anything else you like)
Gateway: vpn.cuhk.edu.hk
User name: yourComputingID (e.g. s1155xxxxxx for students, bxxxxxx for staff)
User password: yourOnePassPassword*
Group name: ipsec
Group password: ipsec-vpn
- (Optional) Check "All users may connect to this network", keep everything else default.
- Apply.
Since the Duo 2FA is now mandatory for all users, as soon as you click "Connect" next to your newly created VPN profile, you should head over to your Duo2FA app and confirm the setting. Check the links below for details.
References: Ofiicial CUHK Duo 2FA guide
Hi, this gist was only for connecting to the ITSC VPN. As I am not from the CSE department, I don't have the credentials or details about that VPN. But I believe the staff responsible for the CSE VPN will be more helpful than the instructions I got for ITSC VPN setup.