Hello
We need to discuss about the most important rules used to protect the server from penetration.
Any one have rule please write here and discuss little for rule how to work.
Regards

I suggest you to search the Forum, read, learn, try, search, read, try .... and then ask questions ....

There are lot of wiki pages available please go thru
wiki.mikrotik.com/wiki/Manual:IP/Firewall/Filter
wiki.mikrotik.com/wiki/DoS_attack_protection
wiki.mikrotik.com/wiki/Basic_universal_firewall_script
wiki.mikrotik.com/wiki/Securing_New_RouterOs_Router

Thank you all