My network configuration for eth0 is:
BOOTPROTO='static'
STARTMODE='auto'
BROADCAST=''
ETHTOOL_OPTIONS=''
IPADDR='192.168.250.1/24'
MTU=''
NAME=''
NETWORK=''
REMOTE_IPADDR=''

I think this is even working after a reboot.
But after some time I end up with a dynamic address anyway:

Hygiea:/etc/sysconfig/network # ip -4 addr show eth0
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP
group default qlen 1000
    inet 192.168.250.103/24 brd 192.168.250.255 scope global noprefixroute
dynamic eth0
       valid_lft 683775sec preferred_lft 683775sec
    inet 192.168.250.1/24 brd 192.168.250.255 scope global secondary eth0
       valid_lft forever preferred_lft forever