> I should have said I am running SL6 x64.

So am I.

Quick paste of my console before and after changes.

[root@server1 modprobe.d]# lsmod | grep nf_
nf_conntrack_ipv4       9440  2
nf_defrag_ipv4          1449  1 nf_conntrack_ipv4
nf_conntrack           79643  2 nf_conntrack_ipv4,xt_state

[root@server1 modprobe.d]# vi /etc/sysconfig/iptables-config

[root@server1 modprobe.d]# service iptables restart
iptables: Flushing firewall rules:                         [  OK  ]
iptables: Setting chains to policy ACCEPT: filter          [  OK  ]
iptables: Unloading modules:                               [  OK  ]
iptables: Applying firewall rules:                         [  OK  ]
iptables: Loading additional modules: ip_nat_ftp           [  OK  ]

[root@server1 modprobe.d]# lsmod | grep nf_
nf_nat_ftp              3473  0
nf_nat                 22788  1 nf_nat_ftp
nf_conntrack_ftp       12911  1 nf_nat_ftp
nf_conntrack_ipv4       9440  4 nf_nat
nf_defrag_ipv4          1449  1 nf_conntrack_ipv4
nf_conntrack           79643  5
nf_nat_ftp,nf_nat,nf_conntrack_ftp,nf_conntrack_ipv4,xt_state



>
> It is there.  But, running /etc/rc.d/init.d/iptables throws an
> error on ip_nat_ftp if I do not previously load ip_nat_ftp
> with modprobe.
>
> What I am after is to load ip_nat_ftp at boot time with
> modprobe.d.
>
> A tape and gum approach would be to load ip_nat_ftp
> in /etc/rc.d/init.d/iptables before it did anything with
> /etc/sysconfig/iptables-config, but I really would like
> to learn the right way to do it in modprobe.d.
>
> -T
>