On Sun, 18 Mar 2001, Paolo Carballo wrote:

<snip>

> ICQ, Yahoo Messenger, and MSN Messenger before deployment. Would it be
> better to use the ports for the last three or would blocking the
> websites do just fine? 

our standard configuration for these type of setups is

1. block *all* traffic, allow only the proxy server direct access to the
Internet.
2. use private ip's internally, then use NAT for those who'd be needing
external access (like ssh, and others)

<snip>

> Since the firewall is already deployed, I think they opted to tinker with
> squid instead just to block the sites.

visit the squid docs

http://squid-docs.sourceforge.net/

there is a sample for this on chapter 7, acl's ... 

hth

-mark

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