hey carlos, I got your email. We did not forget about you.
things are out of place here, lets see what we have
ok the commands
we must assume the the combination of /etc/modules.conf and running the commands have basically installed your network card.
Now where you rebooted, then ran ping, we see that your ip address is assigned. was this assigned manually by you in a script, by dhcp, or from the command line?
we will want to look at the output of this
to see if this is a routing problem
also you might want to check the netmask and ips on your network, make sure you are in the same network
now for the errors, It is starting to look like a kernel problem
here's the deal..
You have tried two different types of nics with the same result, ( I assume the resulting error messages are the same, let us know if they're different) .
so I think it's not the nic
Do you have another kernel you can boot? if not please try to download a different kernel version in the form of a mandrake rpm and try it.