changed ifcfg from dhcp to static ip
 

We have redhad installed minimum.
we want to change the ifcfg-eth0 from dhcp to static ip, but when we restart the network service eth0 doesn't come up.

our ifcfg-eth0:

device=eth0
ipaddr=192.168.1.1
netmask=255.255.255.0
network= 192.168.1.0
broadcast=192.168.1.250
onboot=yes

gr monc

Try the following:
DEVICE=eth0
BOOTPROTO=static
IPADDR=192.168.1.1
NETMASK=255.255.255.0
ONBOOT=yes

I changed ifcfg-eth0 but when i type ifconfig i don't get an Ipadress
it stil doesn't work. Must i change other scripts also?

gr monc

Just using ifconfig isn't going to help unless you manually specify the settings. ifconfig doesn't read ifcfg-eth0. You must restart networking to verify that it reads from the config files properly. On a RH system, do the following:
service network restart