Blocking a remote IP from connecting to your Freesco box

Problem:

You want to prevent a remote user at a specific IP address from connecting to your Freesco box (or any of your machines on your LAN.

Solution:

Login to your Freesco box as root (via telnet). Type:

cd /mnt/router/rc
edit rc_user
Near the end of the file, just below the spot where it says "Starting rc_user...", type the following. Replace <ipaddress> with the IP address you want to ban.

ipfwadm -I -a deny -P tcp -W eth0 -S <ipaddress> -o

Now, restart rc_user with the following command:
/mnt/router/rc/rc_user restart
The user should now be blocked from your machine.