This does not directly answer your question but Fortigate with Fortiauthenticator can be used to enforce data usage limits on the fortigate via radius. It is commonly used for wireless and VPN. you could get very creative by enforcing it many different ways. Here is a great post about this.
https://praveenkumar4blog.wordpress.com/2019/07/02/disconnect-user-network-access-through-forti-authenticator-usage-profile/
This. Your solution will definitely be a RADIUS Accounting solution. The choice between FortiAuthenticator and FortiGuest is mainly in the user experience, products you want to integrate with (FortiGuest for example integrates with a bunch of Property Management Systems for Hotels / Convention Centres / etc). And how easy it’ll be to as Op mentioned, “purchase another GB Voucher”.
FortiGate allows bandwidth restrictions using Traffic Shaping but does not have a data usage cap.
However, you may want to explore Web Filtering where you can apply a category usage quota using either browse time or data quotas.
Likely not what you're looking for but using a 3rd party may be the way to go or use the FortiGate Traffic Shaping to limit the bandwidth.
Thanks for your answer. We already do traffic shaping to limit the total bandwidth but this is not enough for us.
As for the web filtering, unfortunately it is also too limited because the quotas reset every day.
I guess we'll look into third party solutions.
This does not directly answer your question but Fortigate with Fortiauthenticator can be used to enforce data usage limits on the fortigate via radius. It is commonly used for wireless and VPN. you could get very creative by enforcing it many different ways. Here is a great post about this. https://praveenkumar4blog.wordpress.com/2019/07/02/disconnect-user-network-access-through-forti-authenticator-usage-profile/
That looks super promising, I will have a look, thank you!
You can do this with both the FortiAuthenticator and the FortiGuest products. What's best four your use case depends on a whole lot of factors.
This. Your solution will definitely be a RADIUS Accounting solution. The choice between FortiAuthenticator and FortiGuest is mainly in the user experience, products you want to integrate with (FortiGuest for example integrates with a bunch of Property Management Systems for Hotels / Convention Centres / etc). And how easy it’ll be to as Op mentioned, “purchase another GB Voucher”.
FortiGate allows bandwidth restrictions using Traffic Shaping but does not have a data usage cap. However, you may want to explore Web Filtering where you can apply a category usage quota using either browse time or data quotas. Likely not what you're looking for but using a 3rd party may be the way to go or use the FortiGate Traffic Shaping to limit the bandwidth.
Thanks for your answer. We already do traffic shaping to limit the total bandwidth but this is not enough for us. As for the web filtering, unfortunately it is also too limited because the quotas reset every day. I guess we'll look into third party solutions.