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Install Iptables Firewall in Redhat / CentOS Linux

How do I install iptables under Redhat (RHEL) or CentOS or Fedora Linux operating systems?
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Linux Iptables Allow NFS Clients to Access the NFS Server

The portmapper assigns each NFS service to a port dynamically at service startup time. How do I allow legitimate NFS clients to access the NFS server using RHEL / Fedora / CentOS Linux 5.x iptables firewall?
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