Black Box ET0010A User Manual

EncrypTight Deployment Planning

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EncrypTight User Guide

If the ETKMS and the PEP are located on the same subnetwork, the ETKMS to PEP interconnection is 
straightforward. For in-line management when the ETKMS and the PEP are located on different Ethernet 
networks, make sure that the Enable passing TLS traffic in the clear feature is enabled on the Layer 2 
PEPs.

If you need to pass additional traffic in the clear, such as routing protocols, you can route the 
management communications using out-of-band connections or put your management traffic on a separate 
VLAN. 

If you choose to put the management traffic on a separate VLAN, you will need to create a Layer 2 
policy to pass the VLAN tag in the clear. To prevent an interruption in management traffic, set the 
policy’s key renewal/lifetime to zero, which means “do not expire or update.”

With out-of-band management, the management traffic between the ETKMSs and the PEPs is routed over 
a separate network path through the ISP. When communications paths pass through any firewalls, be sure 
to configure the firewalls to pass TLS traffic. 

 shows an out-of-band management scenario with 

the external ETKMS connecting to a PEP on a different subnetwork with Layer 2 PEPs encrypting 
Ethernet data.