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Date: Tue, 25 Sep 2007 22:40:14 +0100
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Subject: Re: PF: block out port 80 so that not allow clients in LAN to
 browse Internet via port 80
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On Tue, 25 Sep 2007 20:52:16 +0700
vuthecuong <cuongvt@fpt.vn> wrote:

> Recently I used squid for cache proxy configured  to go internet
> through port 3128.
> But internet browser in LAN still connect to Internet through port 80
> if in conenction option of Internet browser is chose to connect
> directly to internet,
> not through proxy server.
> So how can I block out port 80 so that LAN clients must go to
> internet through port
> 3128 via proxy server?
> Tnx in advanced
> ________________

Blocking a port with PF is really basic. If you have to ask you would
be better-off reading about PF first, before you do anything. 

http://www.openbsd.org/faq/pf/index.html