Делаем
[root]# modprobe ip_conntrack_ftp
получаем
/lib/modules/2.4.7-10custom/kernel/net/ipv4/netfilter/ip_conntrack.o: init_module: Device or resource busy
Hint: insmod errors can be caused by incorrect module parameters, including invalid IO or IRQ parameters
/lib/modules/2.4.7-10custom/kernel/net/ipv4/netfilter/ip_conntrack.o: insmod /lib/modules/2.4.7-10custom/kernel/net/ipv4/netfilter/ip_conntrack.o failed
/lib/modules/2.4.7-10custom/kernel/net/ipv4/netfilter/ip_conntrack.o: insmod ip_conntrack_ftp failed
почему ?
остальной маскарадинг работает (HTTP,POP3, ...)