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You don't have to run it on the controller. For the network/compute neutron handles the iptable rules, you could add custom rules to allow other traffic to the host if you wanted. It isn't required, but for security you may want to setup custom rules. If you have issues with configuring rules due to familiarity with iptables you could use the "tui" package. It provides a decent text based ui that guides you through setting up rules.

Package: system-config-firewall-tui