network does not work after reboot

Hello,

After reboot eth0 is not active.
When I type "service network restart" there is error:

Bringing up interface eth0: /etc/init.d/functions: line 571: .ifup: No such file or directory

RTNEETLINK answers: File exists
(repeated 9 times)
..

It is very strange because after successful network configuration several months ago I did not change any network setting or scripts.

I have just open Support Case and send sosreport. RedHat support says that configuration ifcfg-eth0 is good, but they can not support me directly because of some formal problems (subscriptions, etc.). I do not understand this, but it is another problem.

Could you help me?

Temporary I have configured network using ifconfig and route commands and its work, but after restart the configuration is lost. I do not want writing some strange script. We use commercial system and everything shold work in professional way.

Best regards,
Kamil Frydryszek