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Barracuda Content Shield

Best Practices for DNS Filtering Deployment

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See also Best Practices for Creating DNS Policies.

Adding a DNS Location

When you click ADD LOCATION on the DNS Filtering page, you are initially prompted to select one of two methods of how to specify an outbound IP address for clients. Barracuda Content Shield policies that you configure are then applied according to the outbound IP address associated with each client. The two methods are:

  • Static IP Address: If the outbound IP address for each client is static (remains the same, as opposed to dynamic), choose  Manually configure outbound IP addresses. Barracuda Networks recommends choosing this deployment, if appropriate, since it is the most simple. Use a 32 bit mask when you enter each outbound IP address.      

For locations with Dynamic Outbound IP address and DDNS usage:

  • For DDNS, install on a machine that doesn’t switch networks.
  • Install only on one machine that’s connected to network you wish you manage.

Note that you can simulate groups by segregating users under different external IP addresses. This provides the option to apply different policies to different groups. For example, the Students group could be assigned a High security policy while the Faculty group could have a Low security policy.

Creating Policies

When creating a policy for a location, Barracuda Networks recommends beginning by selecting the Medium security option. See Best Practices for Creating DNS Policies for more details and examples.

Recommended Medium Policy.png



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