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I am using Zentyal. I want to block with iptables rules. Can you please tell how to block it for my organization's network?

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To use iptables rule im not sure how to do it but if you wish you can use a proxy in zentyal.

** Look for the tab named Domain Filtering in the HTTP Proxy section

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I was able to block facebook without using IP tables. I used a Zentyal network object to represent all the facebook IP ranges, and then blocked those ranges using the firewall that in the Zentyal web interface.

You can read what others have said about this here:,16841.msg66809.html#msg66809

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