Help with DDOS SYN Flood protectio not working

RouterOS General
1

Hello everyone.

I am having massive SYN flood attack and the firewall rule I have against it, it’s not working at all.

The rule I have is:

;;; Add Syn Flood IP to the list
     chain=input action=add-src-to-address-list tcp-flags=syn 
     connection-state=established protocol=tcp address-list=Syn_Flooder 
     address-list-timeout=30m connection-limit=30,32 

 1 X ;;; Drop to syn flood list
     chain=input action=drop src-address-list=Syn_Flooder

Any ideas how to solve this?
Gonzalo.
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