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To help increase security in your perimeter network, we recommend that you deploy Edge Servers in the following way:

• Create a new subnet from your perimeter network router for Office Communications Server.
  
  
• Verify that traffic coming to the Office Communications Server subnet does not route to other subnets.
  
  
• On your perimeter network router, configure rules to ensure that there is no routing between your Office Communications Server subnet and other subnets (with the exception of a management subnet that can include management services for your perimeter network).
  
  
• On your internal router, do not allow any broadcasts or multicasts coming from the Office Communications Server subnet in the perimeter network.
  
  
• Deploy the Edge Server between two firewalls (an internal firewall and an external firewall) to ensure strict routing from one network edge to the other.