InfraGuard

Detection rule: Excessive Distinct SYNs

Connection attempts with many differing SYN/SYN-ACKs.

WarningTCP Stream IntegritySuricata

What it detects

Connection attempts with many differing SYN/SYN-ACKs.

Why it fires

A pattern typical of SYN flooding or scanners.

Worst case

SYN flood

Matching signatures

excessive different syn

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