Howto block all except certain web site

[browndawg74]

I have a computer lab that I want to block all sites except certain site?

[kejianshi]

Thats called white listing.

http://doc.pfsense.org/index.php/SquidGuard_package

http://skear.hubpages.com/hub/URL-Filtering-How-To-Configure-SquidGuard-in-pfSense

[BenKenobe]

Don't know that you necessarily need another app. Why not identify the remote sites IP range and then add a 'block if not' rule to the LAN adapter.

Identify the range simply by pinging from a command prompt, you can put the result into a who is IP search to get the full range although the single IP returned should be sufficient.

[phil.davis]

You can use the URL domain in rules, e.g. www.allowedsite.com
Then pfSense will find (and recheck every 5 minutes) the corresponding IP address(es) and put them in a table in pf. That way if the site does change its IP address, or have multiple addresses, that will be coped with.