In Ubuntu 10.10 the entry in sysctl.conf was changed to 'net.ipv4.ip_forward=1', uncommenting it alone DO enable the ip routing, and no need to add extra lines.
In Ubuntu 10.10 the entry in sysctl.conf was changed to 'net.ipv4. ip_forward= 1', uncommenting it alone DO enable the ip routing, and no need to add extra lines.