Usually iptables are controlled by the root user or someone with sudoer privs.
You can check what iptables rules there are using:
iptables -L -n
That lists all the rules, and doesn’t resolve port names or IP addresses.
To edit the rules, edit the following file:
/etc/sysconfig/iptables
Then you can reload those rules by doing the following:
/etc/init.d/iptables restart
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