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Changing firewall settings after installation of CentOS via kickstart

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http://unix.stackexchange.com – I was trying to install CentOS 6.3 via Windows Deployment Server. And to automate the installation process I used kickstart file in which i provided various details required during installation.Then i wanted that machine to serve as mysql server that can be only accessed via ssh or mysql process,so i wanted to give the firewall rules via iptables. I have verified that these are correct and tested on existing machine.So I gave these these rules in %post section of the kickstart file ....but i encounted the following error “can’t initialize iptables ‘filter’: Table does not exist” .I h (HowTos)