Solaris 10 Routing

The key thing is in your routeadm output. By default in Solaris 10 IP forwarding and routing are off.

To enable IPv4 forwarding, as you have, you can set
#routeadm -e ipv4-forwarding

To enable routing, use
#routeadm -e ipv4-routing

To make your changes take effect and start the routing daemon, use
#routeadm -u

Use the same commands (with ipv6) to enable the IPv6 routing and forwarding.

These changes persist across a reboot.
This should take care of your problem.