ip forward

[Tom H]

>> Make a new network script
>> Cat /etc/sysconfig/network-scripts/ifcfg-eth0:0
>> DEVICE=eth0:0
>> BOOTPROTO=none
>> BROADCAST=199.23.200.255
>> HWADDR=00:11:43:37:06:D5
>> IPADDR=199.23.200.90
>> NETMASK=255.255.255.0
>> NETWORK=199.23.200.0
>> ONBOOT=yes
>> TYPE=Ethernet

> I still do not succeed to have the needed result.

Please post the ifcfg-... and route-... files that you have in
/etc/sysconfig/network-scripts/.