Subject: Re: content filter
To: Water NB <netbsd78@126.com>
From: matthew sporleder <msporleder@gmail.com>
List: tech-net
Date: 08/28/2006 12:48:26 
On 8/28/06, Water NB <netbsd78@126.com> wrote:
> Is there a tools to filter network by content?
>
> For example. On my gateway:
> I must permit other PCs use http to browser web site.
> And I must deny them using http proxy.
>
> How can I?

It sounds like you have the solution right there.  Use a proxy.