Can't get to certain ftp sites through my firewall
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echo " Enabling SNAT (MASQUERADE) functionality on $EXTIF"
$IPTABLES -t nat -A POSTROUTING -o $EXTIF -j MASQUERADE
I had to remove my initial comments because I re-read your post and realized my mistake.
Ok... the script I have extracted in the quote above will open everything up and you should be able to access your ftp.
I'll look through this script after lunch to find the cause of your woes but in the meantime, you should check out some of the recent IPTABLES threads on this forum... they'll help you setup a more secure firewall - default policies of ACCEPT mean "come on in!!"