How can I protect brute force attack in LTM

hi, i am korean. so, i can't english very well

 

but i want you to help me

 

i used BIG-IP 11.5.3 HF.2 and LTM

 

NOT ASM

 

So, I want protect brute force attack in LTM for login page

 

how can i do ??

 

plz help me

 

used iRule, and data group

 

But I see the link below, it was not good.

 

https://devcentral.f5.com/codeshare/protecting-login-pages-against-brute-force-attack-v1

 

 

I look logs, but I can't understand.

 

plz help me