Hello Hotrod
I have no firewall and running XP Home SP1 and with router port forwarding 21 and 20 ,both TCP, pointing to the local PC which host the FTP server. Latest checked the cable modem IP is the same as provided in the beginning of the post. Account 'guest' has upload and dnload rights set to it.
I don't know what else needs to be set in Cerberus. I had it working about 1 months ago but PC fails then I forced to re-format hard disk so life began once again. Just a bit of history.
Cheers
miki