PEAR::Auth_RADIUS provides wrapper-classes for the RADIUS PECL. There are different Classes for the different authentication methods. If you are using CHAP-MD5 or MS-CHAP you need also the Crypt_CHAP package. If you are using MS-CHAP you need also the mhash and mcrypt extension. WWW: http://pear.php.net/package/Auth_RADIUS/