Brute Force Attack

Hi,

1 of our server is having brute force attack almost everyday.
219.252.1.125
206.51.234.240
66.199.234.202
69.7.15.138
138.195.8.38
220.70.167.67
168.75.177.103

last 10 days more less same ip's was trying ..
apf and bfd installed but sometimes apf couldn't block ip's and server was going down ..

Is there any other way to protect servers against them?

How can i put block sub-net ? Korea, Hong Kong, China

should we do any other cause all listed in deny_hosts.rules ...

Your help is much appreciated

 

 

 

 

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