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1. Log in to the [Cloudflare dashboard](https://dash.cloudflare.com) and
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select your account.
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2. Go to **L3/4 DDoS** > **Advanced Protection** > **Advanced TCP Protection**.
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3. Under the system component for which you are creating the filter (**SYN Flood Protection** or **Out-of-state TCP Protection**), select **Create** next to the type of filter you want to create:
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-**Mitigation Filter**: The protection system will drop <GlossaryTooltipterm="data packet">packets</GlossaryTooltip> matching the filter expression. - **Monitoring Filter**: The protection system will log
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packets matching the filter expression.
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- **Off Filter**: The protection system will ignore packets matching the filter expression.
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4. Under **When incoming packets match**, define a filter expression using the Expression Builder (specifying one or more values for **Field**, **Operator**, and **Value**), or manually enter an expression using the Expression Editor. For more information, refer to [Edit rule expressions](/ruleset-engine/rules-language/expressions/edit-expressions/).
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