I am not sure if this is possible, but I suggest we do not allow user using a VPN to connect to ECC. That would actually make IP bans work, and many permabanned or banned players won't try to use an alt account to come back. As I said, I am not sure if this can be done, but I'd like to see some feedback below. Thanks. @JamieSinn As I have no idea how this kind of stuff works, mind giving me some insight on if this can be done?
Not possible. A VPN is a service that allows you to browse the internet anonymously. Some of them may use the TOR network, and thus you can block those. But most don't. You don't know which IPs the VPN uses, you don't have any way to detect it either. Not to mention a lot of people use VPNs for privacy purposes. (like me) I use it to keep my actual IP hidden, as I've been targeted by DDoS before. Anyway.. not possible. VPN is designed in a way that it's virtually undetectable.
Quite a good summary right here, as kuke said, its literally impossible. I myself use multiple vpn's so I can access my home networks up for development sites that work off of ip auth.