Any solution for Internet flow charge?

Is there any good suggestion for Internet flow charge? I think Radius or TACACS+ could do, but I had no experience with them. Any total solution for it? Is there any special hardware I should use? 25XX or 36xx? _ FAQ, list archives, and subscription info: ht

Any solution for Internet flow charge?

Is there any good suggestion for Internet flow charge? I think Radius or TACACS+ could do, but I had no experience with them. Any total solution for it? Is there any special hardware I should use? 25XX or 36xx? _ FAQ, list archives, and subscription info: ht