help

I'm just trying to use Redis DB with radius server by default it uses MySQL server for authentication and authorization. I tried by changing the default config (used redis instead of sql) but it didn't work, it complains like "*redis" modules aren't allowed in 'authorization' sections -- they have no such method*". I am just wanted to know What are the config changes are required for that? I haven't found any such documentation that explains it. Can anyone please help with this?