gonzalezmauro,

Sorry for a long delay, been busy porting my apps from Win2k to Linux.

Try this:
Check your /etc/sysconfig/network-scripts/ifcfg-eth0 if it exist it should contain your settings.
for example:

DEVICE=eth0
IPADDR=10.0.0.1
NETMASK=255.255.255.0
NETWORK=10.0.0.0
BROADCAST=10.0.0.255
ONBOOT=yes

if you have other network cards, files are named ifcfg-eth1, ifcfg-eth2 respectively. Also check that ONBOOT=yes.
That should do it. Reboot then try if you can connect.