4 Nov 2011
em /etc/sysctl.conf descomentar a linha net.ipv4.ip_forward = 1.
depois executar:
#sysctl -p /etc/sysctl.conf
para ativar o nat:
up iptables -t nat -A POSTROUTING -o $IFACE -j MASQUERADE
down iptables -t nat -D POSTROUTING -o $IFACE -j MASQUERADE
no interface que liga à internet
http://www.ducea.com/2006/08/01/how-to-enable-ip-forwarding-in-linux/
http://www.debianadmin.com/activate-nat-on-debian-etch-and-disable-ipv6…