Linux system to start automatic activation of the network card solution _unix Linux

Linux every time you start the network card must be activated to the Internet, it is very troublesome.
On the Internet to find information, and finally this solution:
# vi/etc/sysconfig/network-scripts/ifcfg-eth0:1 View the eth0:1 configuration file.
All said that there is onboot=yes this sentence can start automatic activation, but the configuration file clearly has or did not work, the boot is always manually to activate.
So add in the/etc/rc.d/rc.local file
Ifup eth0

Or
Ifconfig eth0 up
Eth0 is to activate the network card, my system is eth0:1, so with Ifup eth0:1.