Thanks for the replies.
Guy, you're right the included firewall works great. I'm just trying to learn from the examples in Michael Rash's "Linux Firewalls".
Curaga, thanks for pointing me in the right direction:
"sudo cat /root/ipt.save | iptables-restore
Your command above was run as the user, you need root privileges to load modules."
My understanding from TC faq, "Administrator / SuperUser / Root:" was that the best way to obtain root priviledges is to use sudo.
If that is incorrect, I'm happy to try another way.
I've looked thru the Sudoers Manual, but haven't understood it yet.
Adding an additional sudo before 'iptables-restore' avoids the error messages about modprobe and initializing table 'nat'. Unfortunately, the ipt.save file does not get transferred to the file, iptables-restore.
ls -l shows iptables-restore with lrwxrwxrwx permissions.
But, sudo chmod ugoa+rwx iptables-restore (just to make sure) generates "iptables-restore; Read only file system"
Bob