Here are the guides that helped
https://www.expressvpn.com/support/vpn-setup/share-vpn-connection-mac/
https://support.purevpn.com/internet-connection-sharingics-on-mac
https://wiki.it.ufl.edu/index.php?title=L2TP_VPN_for_Windows_10
TLDR:
On a Mac:
- System Preferences
- Networks
- +
- Interface: VPN
- Service Name: MY_CUSTOM_VPN
- Service Address: l2tp.vpn.ufl.edu
- account name:
- Authentication settings:
- Password:
- Shared Secret:
- Advanced -> Send all traffic over VPN connection
==========
Click connnect
==========
- System Preferences
- Sharing
- Internet sharing
Share your connection from: MY_CUSTOM_VPN
To computers using: Wifi
