CBQ and/or HTB help needed

[maze at cela.pl (Maciej Żenczykowski)]

I'm not sure how to determine whether a given network packet is an FTP 
packet or not...

the ftp-data connection has no strictly specified TCP ports - it can be a 
normal TCP connection between a random port on your computer and a random 
port on someone else.  (most ftpd's do not use the ftpdata tcp port for 
anything instead using unpriviledged random high port numbers)

...
MaZe.