lartc.org : Linux Advanced Routing & Traffic Control
(Answer) (Category) lartc.org FAQ :
Shaping ftp traffic
Ftp uses random ports, so matching the data traffic is not easy. However it can done if you use iptables to mark ftp-data packets and use that mark with the fw filter. For more info see http://home.regit.org/connmark.html.

General information about the conntrack module can be found here.
stef.coene@docum.org

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