General information for firewall and firewalld

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http://forums.fedoraforum.org – The story starts when I read the news about Linux Trojan. I tried to block the IP of that trojan but one led to another and now I'm confused about Fedora firewall. However I wonder if anyone can help to figure out what's the difference between firewall and firewalld? Should I download firewalld on my system? Which one is better original firewall comes with fedora 17 or firewalld? To sum up how can I have a good firewall protection on my system? In this forum are thousands topic about security, I read some of them, I understand Linux security is very complicated, And now a b (HowTos)