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 recommends choosing this deployment, if appropriate, since it is the most simple. Use a 32 bit mask when you enter each outbound IP address.
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.
When creating a policy for a location, Barracuda recommends beginning by selecting the Medium security option. See Best Practices for Creating DNS Policies for more details and examples.