Some routers come with filter that will let you do it. Or this how to may
help.
how to restrict internet access
How to restrict Internet Access. You may have many options to disable
a user or computer to access the Internet. Some options can be adopted for
many users ...
www.howtonetworking.com/Internet/restrictie0.htm
--
Bob Lin, MS-MVP, MCSE & CNE
Networking, Internet, Routing, VPN Troubleshooting on
http://www.ChicagoTech.net
How to Setup Windows, Network, VPN & Remote Access on
http://www.HowToNetworking.com
"Benny" <Benny@discussions.microsoft.com> wrote in message
news:26B691FC-3C00-4D58-A599-BB54F4DB5BDE@microsoft.com...
>I have 10 workstations and a server at my workplace. The computers are all
> shared by all employees, so it is impossible to know who is sneaking looks
> at
> restricted sites. Is it possible to funnel all the workstations through a
> common gateway that will only allow websites that I want them to have
> access
> to? I would like to be able to enter a list of 10-15 websites and restrict
> all other internet traffic to the workstations.