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
[EDIT]
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!!"
[/EDIT]
Hmm... off the top of my head, it looks like your DNAT rules may be interferring with proper communications. Is your 192.168.0.4 machine is an ftp server and an irc server? (Server, not client)
I think your DNAT'ing rules to port forward 10060/61 are the cause.
For an internal ftp server, you only need the rule
$IPTABLES -t nat -A PREROUTING -i $EXTIF -p tcp --dport 21 -j DNAT --to-destination 192.168.0.4
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