Create a rule
To create a SYN flood rule or an out-of-state TCP rule:
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Log in to the Cloudflare dashboard and select your account.
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Go to L3/4 DDoS > Advanced Protection > Advanced TCP Protection.
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Depending on the rule you are creating, do one of the following:
- Under SYN Flood Protection, select Create SYN flood rule.
- Under Out-of-state TCP Protection, select Create out-of-state TCP rule.
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In Mode, select a mode for the rule.
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Under Set scope, select a scope for the rule. If you choose to apply the rule to a subset of incoming packets, select a region or a data center.
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Under Sensitivity, define the burst sensitivity and rate sensitivity of the rule (by default, Medium). The sensitivity levels are based on the initially configured thresholds for your specific case.
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Select Deploy.