Blocking access to specific Ip addresses

Hi all,

I have some servers with public IP addresses that are behind an mikrotik router, I can access them fine but would like to restrict access to a list of IP addresses only.

Can someone point me in the right direction to do this?

The current setup looks like this:

Internet ----- Mikrotik router (32.23.13.4) ------ Server (32.23.13.4)

Thanks.

http://wiki.mikrotik.com/wiki/Manual:IP/Firewall/Filter