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linux firewall

RHEL / Centos Linux Disable Firewall

How do I disable firewall on CentOS or Red Hat Enterprise Linux server version 5.x/6.x running on my HP micro server?
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I'm new to Linux and my boss told me to remove ssh server as we don't need to provide the remote login and file transfer capabilities of SSH. How do I disable and remove OpenSSH server?
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Q. I've CentOS Linux server configured with APF firewall. How do I open port 22 from specific IP address only? I've fix static ADSL IP address assgined and I'd like to open port 22 from my IP 202.5.1.3 only using APF firewall script. How do I configure firewall?
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Q. I've Linux box acting as software router (natted) for over 100 computer connected via LAN. Regular netstat command is not displaying the list of all natted connections. How do I find out connections managed by netfilter / iptables which comes with the Debian 4.x system?
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HowTo Disable The Iptables Firewall in Linux

I need to disable firewall in Linux for testing purpose. I'm using CentOS and RHEL version 4.4 / 5 / 6. How do I disable the firewall in Linux?
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