How to block a particular website to the clients?

[lilchakki]

Hi,
I have a proxy server configured on RHEL 5. My boss wants me to block Orkut and other social sites to few client machines. I am not sure how to block any particular site from RHEL server.
In short, please advice me to configure this RHEL server as a websense to block few websites.
Thanks in advance.

[RobinVossen]

Either do it Dirty and change the hosts file. (this can be evaded)
Or install Squid =)

[Lazydog]

You need to setup your network that anyone trying to get to the internet must go through the proxy. This can be done with IPTABLES. Once this is done configure the proxy to reject/block the site you don't want them visiting.

[lilchakki]

Thank you for the reply..

Well i have configured Squid already.
I already applied the the codes in squid.conf but still site is open.

acl blocksites url_regex "/etc/squid/squidblock.acl"
http_access deny blocksites

I listed .orkut.com in /etc/squid/squidblock.acl file, but i am still able to access the orkut site.
Restarted the Squid many times.

[Lazydog]

Did you configure your browser to use the proxy?
Did you configure your network to block all web traffic and reroute to the proxy except the traffic from the proxy?

If you setup a proxy and don't tell the browser to use or require all traffic going to the web to use the proxy it will be bypassed.