Black Box ET0010A User Manual

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Creating Distributed Key Policies
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EncrypTight User Guide
Figure 79
Point-to-point policy editor
Adding Layer 4 Policies
Layer 4 policies encrypt only the payload of the packet. The source and destination addresses, protocol, 
and port in the IP header are sent in the clear. With Layer 4 policies, the Layer 4 header information is 
sent in the clear for traffic engineering and Service Level Agreement management (for example, Quality 
of Service controls or NetFlow statistics monitoring). You can create Layer 4 policies for point-to-point, 
hub and spoke, mesh, and multicast network topologies.