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Chapter 26. Deploying Crystal Enterprise... > Exploring the NAT and Crystal Enterp...

Exploring the NAT and Crystal Enterprise Relationship

It has been established that within Crystal Enterprise, server-to-server communication takes the single TCP connection approach one step further. A second TCP connection is made when servers communicate in Crystal Enterprise (listen on one, communicate on another). When it comes to firewalls, it is important to recognize that two ports need to be open.

However, with translated IP addresses in the NAT instance, there is an additional concern because it is the IOR that tells the servers which IP to use; this is not directly retrieved from the packets themselves. This section explains what is required to make Crystal Enterprise work with a NAT firewall—the WC and WCS communication as an example.


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