How to enable both interface up and running, on VM creation

I have attached two NIC to VM instance with redhat-6 image, the Image booted up properly, the vm console only shows one interface up

ci-info: +--------+-------+-------------+---------------+-------------------+
ci-info: | Device |   Up  |   Address   |      Mask     |     Hw-Address    |
ci-info: +--------+-------+-------------+---------------+-------------------+
ci-info: |   lo   |  True |  127.0.0.1  |   255.0.0.0   |         .         |
ci-info: |  eth1  | False |      .      |       .       | fa:16:3e:23:23:30 |
ci-info: |  eth0  |  True | 10.0.255.21 | 255.255.255.0 | fa:16:3e:d7:ce:17 |
ci-info: +--------+-------+-------------+---------------+-------------------+

The eth0 is public interface and eth1 is private network,