How to install
0. Read README.pppdradius

1. Copy all files in your pppd sources directory

2. Apply patch: patch <pppdradius.patch

3. Run make

4. cp config.sample /etc/ppp/radius.config

5. edit radius.config

6. Set new option to your pppd config file: radius <config_file_name>

7. Check if your RADIUS server is running

8. Enjoy it!