On Jun 9, 2015, at 10:42 AM, Marc Beaumont <marc.beaumont@comms365.com> wrote:

I want to set a usage counter for users on my Radius box and if possible disconnect them when they reach their usage allowance via a post-acct.

Does the NAS support Disconnect-Request? If so, this is possible. Otherwise, it's not possible.

Is this possible to do without having to use an SQL back end counter as I currently only use the files to define users, store accounting etc.

What's the best recommendation on how to achieve this?

Use a database to store accounting data. Alan DeKok.