Linux Suse 10.2 Firewall
 

I am trying to configure my firewall so that there are no security holes. Could you please provide me with any information.

Thank you very much.

Well, linux firewall is builded in the kernel and named netfilter.
Interface for configuring it named iptables.
You can get plenty of help with man iptables and with Google.

On SuSE the SuSEfirewall2 script in /etc/sysconfig is used to create the firewall rules and is well documented with what each bit does. Depending on your knowledge of firewalls and iptables specifically you should be able to do pretty much what you want from the examples. The default setup is pretty safe to start with. If you don't know much about iptables and the various threats I can recommend Linux Firewalls book.