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IPv6_TCP_SYNFLOOD.zip
This ZIP file contains and example of an IPv6 TCP SYN flood attack.
A SYN flood is a denial-of-service (DoS) attack that exploits the TCP three-way handshake by overwhelming a target with a large volume of SYN (synchronize) packets, causing the target to exhaust connection resources and become unable to serve legitimate clients.
Under normal conditions, TCP connection setup follows this sequence:
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Client → Server: SYN
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Server → Client: SYN-ACK
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Client → Server: ACK (connection established)
In a SYN flood attack:
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The attacker sends massive numbers of SYN packets to a server.
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The server responds with SYN-ACKs and allocates memory/state for each request.
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The attacker never completes the handshake (no final ACK), or uses spoofed source IPs so replies go nowhere.
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The server accumulates half-open connections until its connection table, memory, or CPU resources are exhausted.
Once this happens, legitimate clients cannot establish new connections, resulting in service degradation or complete outage.
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