Instant Messenger blocking for the company.

Is there a way I can block all instant messaging for the company so no one can do messaging for the company.

I have a PIX 520.

The PIX can only block traffic either by IP address or port and never on the level of the application. Blocking of instant messaging programs, it is a bit difficult and delicate. The type of application that you are trying to block has the ability to dynamically change the ports which makes it difficult to block. The best way to IM blocking would be to search for the Instant Messaging server's IP addresses and block them from inside the network through the list of access or the pipes. However, as the ports used by the application, the IP addresses change as every now and then.

Tags: Cisco Security

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