Changes

#*POSTROUTING chain of nat table

#On vm01 add iptables log rules to monitor ftp traffic (control and data) for the following:

#*INPUT chain of filter table

#*OUTPUT chain of filter table

#*While monitoring your packets using "tail -f /var/log/messages" - test your firewall by logging into a second PC (try both Windows and Linux) and attempt an FTP connection to your gateway PC. Test both local user as well as anonymous connections.