# Define DNS Protocol parameters

The DNS protocol parameters control DNS protocol enforcement.

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When you activate this feature, the engines can determine if traffic on the DNS port is actual DNS traffic or some other application that misuses this commonly open port. For example, peer-to-peer file transfer applications might use this port).

For more details about the product and how to configure features, click Help or press F1.

## Steps

1. In the properties of a custom Service you have created, click Select next to the Protocol field and select DNS.
2. On the Protocol Parameters tab, set the parameters for the Protocol.
3. Click OK.