making a boot server

I'm trying to make a boot server so I can net boot another machine that doesnt have a cdrom.
I want to boot this machine so i can go in and erase the (unknown to us) root password.

on solaris 9, i ran setup_install_server -b /export/install
I entered the clients machines mac address and ip in /etc/ethers.
I entered the ip address and hostname in /etc/hosts
I started /etc/init.d/boot.server

I still cant boot from the net, any ideas?
I dont wqant to make a full jumpstart server if i dont have to, i just wanted something to be able to boot this one machine into single user mode to change the passwd, the client machine has no cdrom.

You still beet to add it to the bootparams, use the add_install_client to do so, and it should boot ok.