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Bring up alias interface on boot, when the main interface is down

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http://unix.stackexchange.com – In my CentOS 6.2 server, I have the following configuration for networking: It isn't installed NetworkManager service on eth0 I have a DHCP configuration on eth0:1 alias interface I have a static IP, lets say 10.10.10.10 When I have connected my server to internet and boot up, both interfaces are brought up well, but when I don't have a connection to the internet (with other words, when it isn't allocated an IP through DHCP to the main interface) and boot up, the alias interface is also down. Question: Is there a way to prevent this behavior? Or how to bring up the alias interface when b (HowTos)