Publish a new configuration file with php artisan vendor:publish in the configuration folder of Laravel you will find config/ldap.php and modify to your needs. For more detail of the configuration you can always check on ADLAP documentation
'plugins' => array(
'adldap' => array(
), // Load balancing domain controllers
'base_dn' => 'DC=domain,DC=local',
'admin_username' => 'admin', // This is required for session persistance in the application
'admin_password' => 'yourPassword',
Please note that the fields 'admin_username' and 'admin_password' are required for session persistance!
The LDAP plugin is an extension of the Auth class and will act the same as normal usage with Eloquent driver.