Block some websites by URL

hi, i have read this article
http://wiki.mikrotik.com/wiki/How_to_Block_Websites_%26_Stop_Downloading_Using_Proxy
i have a RB150 and i want to block some websites to some clients by URL (allowing wildcards)
but i don’t want to use webcache, because it’s a RB150.

how can i do it? is the article above suitable for me?

Try OpenDNS

http://www.opendns.com

It’s free, and allows you to register your subnets so that you can filter URLs, and more… pretty neat, no extensive configuration just setup your DNS cache or client computers to point to their DNS servers.

Although if you’re users are smart enough they could just bypass the cache by specifying different caching servers on their client… The work around to this would be to block all DNS traffic unless it goes to your DNS cache (or OpenDNS’s cache depending on how your network is configured).

nice suggestion… i will try it at school.

but it don’t solve my problem… i have a company that want some computers only to access certain websites. other computers to have full access to the web.
i will install a RB150.
the person that will add and remove websites from the mikrotik doesn’t know anything about computers jajaaa and i don’t want to teach how to obtain the ip associated to a website and allow it in the firewall, etc, etc, etc…
i want something more easy, like use domain names instead of ips

set max cache size to zero and you will be able to use the access list on RB150:
http://www.mikrotik.com/testdocs/ros/2.9/ip/proxy.php

that’s the workaround!!!
thanks