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The first time you installed you have installed the source rpm.
Also if you have used "su" command to login as root
service iptables start
Will not work since service command is available in /sbin/ directory.
For that you will have to login as "su -"
Also before u install an rpm use
rpm -qip rpmname
To see the information of the package and then go for install.
less rpm
Should also give u all information about that rpm file.
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