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RE: How to tell if a Linux machine is a zombie?

James Stevenson wrote:

>> If I understand the matter correctly, a firewall can protect only
>> against incoming messages, and is useless against spyware which
>> "phones home" or zombie-ware which spews email spam.
> Not totally correct. A firewall is only as good as the traffic that is
> permitted to flow across it. If you want to block something from phoning
> home then yes you can block outbound traffic as well.

Blocking outbound traffic on specific ports is the advisable method. 
Wholesale blocking outbound traffic might make it interesting to get
internet connectivity.

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