Intentional SYN Drop for mitigation against SYN flooding attacks

Document Type Expired Internet-Draft (individual)
Last updated 2019-06-07 (latest revision 2018-12-04)
Stream (None)
Intended RFC status (None)
Expired & archived
plain text pdf html bibtex
Stream Stream state (No stream defined)
Consensus Boilerplate Unknown
RFC Editor Note (None)
IESG IESG state Expired
Telechat date
Responsible AD (None)
Send notices to (None)

This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


This document proposes an option to mitigate SYN flooding attacks, called Intentional SYN Drop (ISD). This option can mitigate the SYN flooding attack by intentionally dropping the first SYN. It also includes a connection management mechanism to detect intelligent attackers who mimic normal clients. Therefore, it can effectively mitigate the SYN flooding DDoS attack.


Sungwon Ahn (
Minho Park (

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)