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# Using Diffusion Restreinte mode on SNS firewalls

In SMC, a set of security settings that comply with “Diffusion Restreinte (DR)" mode can be enabled on SNS firewalls. This feature guarantees a very high level of confidentiality for communications that pass through the IPsec VPN.

To enable DR mode in SMC, you must first verify whether the configurations on connected firewalls are compatible with DR mode requirements, and where necessary, fix the anomalies in incompatible configurations.

For more information regarding DR mode on SNS firewalls, refer to the SNS User guide and the technical note IPSec - Diffusion Restreinte mode.

This feature is available on SNS firewalls in at least version 4.3.

Firewalls in DR mode can be connected to an SMC server on which DR mode is not enabled.