Help For Buy a RouterBoard

Hello guys.

I have a Dedicated server - colocation . (HP DL360 G7)
I need a firewall that monitor my dedicated server packets and block attackers IP’s and other things .

Which RouterBoard Hardware Can do this work perfectly .
I use of my dedicated server for selling vps servers.

Thanks for reply .

You probably need a model from the CCR range.
But you need to precise your need : which physical ports needed ? what bandwidth to process ? which type of filtering rules ?