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packet filtering

How To: Disable Firewall on RHEL / CentOS / RedHat Linux

I don’t want firewall because I only run one http (port 80) public service. How do I turn off or disable firewall permanently under RHEL / Fedora Linux / Red Hat Enterprise Linux and CentOS Linux?
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Iptables Open FTP Port 21 and 20

How do I open port 21 using Linux iptables firewall?
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