Is ip_conntrack_ftp superceeded?

[Todd And Margo Chester]

Hi All,

   In CentOS 5.x I have had to use

        /etc/sysconfig/iptables-config
        IPTABLES_MODULES=ip_conntrack_ftp

to get active mode ftp to work with my iptables
firewall

In SL6, ip_conntrack_ftp is nowhere to be found, but
active mode ftp still seems to work.  Has ip_conntrack_ftp
been gobbled up into iptables?

Many thanks,
-T