How to mitigate TCP SYN Flood attack and resolve it on Linux
TCP SYN flood is a one type of DDoS (Distributed Denial of Service) attack that exploits part of the normal TCP three-way handshake to consume resources on the targeted server and render it unresponsive.
With SYN flood DDoS, the attacker sends TCP connection requests faster than the targeted machine can process them.
A normal TCP between a client and server establish three-way handshake, the process is looks like this:
On first connection, client request connection by sending SYN (synchronize) packet to the server
Then server send responds to that initial packet with a SYN/ACK packet, in order to acknowledge client and server communication
Client responds with an ACK (acknowledge) message, and the connection is established.
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