iptables not so stateful

[Clement]

I have this in the iptables setup:
$ADD INPUT   -p tcp  -m state --state ESTABLISHED,RELATED -j ACCEPT
$ADD INPUT   -p udp  -m state --state ESTABLISHED         -j ACCEPT
$ADD OUTPUT  -p tcp  -m state --state ESTABLISHED,RELATED -j ACCEPT
$ADD OUTPUT  -p udp  -m state --state ESTABLISHED         -j ACCEPT
$ADD OUTPUT -p tcp --dport 21 -j ACCEPT
....
And I cannot do ftp.  All the data mode traffic of FTP are blocked.  
Apparently the ESTABLISHED,RELATED specification is not followed.  The 
module ipt_state is there and executing the above does not show any 
error message.  I have tried "modprobe ipt_state" before the above to no 
success.  Any idea?

H/W is Intel PIII-600,  OS is Sarge with kernel 2.6.7.
Thanks.
Clement

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