Question how to create Jail Defending against a SYN-Flood (DOS) Attack?

[tomer628]

hi.
i saw in the Link : [Security] Defending against a SYN-Flood (DOS) Attack – Help Center
a guide how to
Defending against a SYN-Flood (DOS) Attack...
And I want to create a Jail on Fail2ban that will recognize DOS and will give them ban...

how can I do that.. witch code I need to put in there?

thank for any idea...

regards,
Tomer.