Your browser does not seem to support JavaScript. As a result, your viewing experience will be diminished, and you have been placed in read-only mode.
Please download a browser that supports JavaScript, or enable it if it's disabled (i.e. NoScript).
Please explain me how to use function of pre-autheniction And give some example
It's been discussed and answered on the forum before, turned up in the first thread I found in a search.
http://forum.pfsense.org/index.php/topic,34148.msg181641.html#msg181641