In last week’s Gearhead about how ports work, our fingers got a little overzealous ... As we said last week, a computer responds with a SYN-ACK when it receives a SYN packet from another machine.

To understand how ports work and the ways they behave ... The normal response to a SYN request is a packet with the SYN and ACK flags set, the source’s sequence number incremented by one ...

SYN-ACK, and RST-SYN flood at the first level of protection. The situation becomes even more interesting with another attack vector—HTTP flood. How HTTP flood protection works The second level o ...

Amplification works by spoofing the target’s IP address ... and because of quirks with some middlebox implementations, attackers get a SYN, ACK, or PSH+ACK flood for free. Another middlebox ...

Known as the "SYN, SYN-ACK, ACK handshake," computer A transmits a SYNchronize packet to computer B, which sends back a SYNchronize-ACKnowledge packet to A. Computer A then transmits an ...

It is accomplished by not sending the final acknowledgment to the server's SYN-ACK response (SYNchronize-ACKnowledge) in the handshaking sequence, which causes the server to keep signaling until ...

How many SYN packets without an ACK would it take to constitute a "flood". We're needing a definition to establish a threshold past which less technical folks can start sending out pages and such.

The specific type of TCP attack used in the recent spate of DDoS efforts were TCP SYN-ACK reflection attacks. The last 30 days has seen a renewed increase in distributed denial-of-service (DDoS ...