LAMP How To – Open Source At Work

system-config-securitylevel provides the user an easy interface to edit firewall rules. If you only need to open up certain tcp and udp ports, this tool may prove handy. For more complex routing rules, you are tempted to edit /etc/sysconfig/iptables directly.
If you have used system-config-securitylevel before, check out the iptables file and you will see this [...]

nfs can be setup easily using the GUI, ie

yum install system-config-nfs

The problem with nfs is that it uses certain random ports. If you have firewall enabled, you have problems. The trick is to fix the ports that nfs uses and simply enable those ports in the firewall. After checking up /etc/services, I chose a few [...]