[Installing Oracle DataBase Server 11.2.0.3 on Oracle Linux 6.3]: Setting OS Parameters Before Starting

Some comments on the following command. Create a backup of the /etc/selinux/config file, and change the SELINUX parameter value from enforcing to disabled

# sed -i.bkp -e "s/SELINUX=enforcing/SELINUX=disabled/g" /etc/selinux/config

Here, we create a backup and change the timeout value from 5 to 0

# sed -i.bkp -e "s/timeout=5/timeout=0/g" /boot/grub/grub.conf

Turn off firewall

# service iptables stop

Disable firewall from starting at boot

# chkconfig iptables off

I recommend going directly to the latest version of the document, which uses newer software versions

Link to the Oracle installation document.