If you want to just shut it off temporarily run as root:
service iptables stop
If you want it to stay off completely:
chkconfig iptables off
Also, if you using the Redhat firewall GUI to check the status of the firewall, that's why it looks like it's still on. The Firewall GUI has a bug that no matter what the firewall is set to, it will display "high" by default. However, your firewall is still at whatever level you set it to.
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