Deny IP address's

Hi All I would like to create a list of IP address's that should be denied all access to my server. I have currently 2 or 3 people making a deliberate effort to hack into my SSH port, and so I would like to deny them access to it at firewall level, as well as all other ports. I can't seem to find information in the Suse documentation on firewall2. Many thanks Nigel Gaylard