Hi thansk for you answer,
I have this line for the redirection from internal LAN to eth2
# Al firewall tenemos acceso desde la red local
iptables -t nat -A POSTROUTING -s 192.168.0.0/24 -o eth2 -j MASQUERADE
But this line have a problem, because my internal LAN is 192.168.2.0/24 and not 192.168.0.0/24
I can solve this problem making this change on the same line. Where be 192.168.0.0/24 change to 192.168.2.0/24
# Al firewall tenemos acceso desde la red local
iptables -t nat -A POSTROUTING -s 192.168.2.0/24 -o eth2 -j MASQUERADE
Thanks every body!!!