Pre-Filter

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The Prefilter is designed for application-specific attacks. It enforces strict TCP/UDP authentication. New TCP clients must perform their initial TCP handshake twice: once to the DDoS Filters, after which the DDoS Filters transparently forward the session.

The Filters send the scrubbed traffic directly to generic mitigation. It also scrubs UDP traffic for some games/applications, which you can see in the list below.

Any UDP traffic flows permanently through the filters. The traffic is then sent back to the generic mitigation.

Please note: Sessions that are created only a few seconds after the threshold is reached can still be dropped.