Can't load MASQUERADE module!

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I'm trying to a simple NAT scripton a rh9 rawhide kernel:

/sbin/modprobe iptable_nat

/sbin/iptables -t nat     -F
/sbin/iptables -t nat     -A POSTROUTING -o  eth0        -j MASQUERADE

Which gives the error:

iptables: No chain/target/match by that name

or, if I plug in a -v :
MASQUERADE  all opt -- in * out eth0  0.0.0.0/0  -> 0.0.0.0/0
iptables: No chain/target/match by that name

But this works:

/sbin/iptables -t nat -A POSTROUTING -o eth0 -j SNAT --to-source 10.10.10.1

So I figure I need some kernel module installed. I find these from lsmod:

iptable_mangle 2712 0 (autoclean) (unused)
ipt_state 1048 2 (autoclean)
iptable_filter 2348 1 (autoclean)
iptable_nat 20632 1
ip_conntrack 26120 2 [ipt_state iptable_nat]
ip_tables 14520 6 [iptable_mangle ipt_state iptable_filter iptable_nat]


In the modules kernel/net/ipv4/netfilter folder I see ipt_MASQUERADE. So...

/sbin/modprobe ipt_MASQUERADE
/lib/modules/2.4.20-20.1.2013.nptl/kernel/net/ipv4/netfilter/ipchains.o: init_module: Device or resource busy
Hint: insmod errors can be caused by incorrect module parameters, including invalid IO or IRQ parameters.
You may find more information in syslog or the output from dmesg
/lib/modules/2.4.20-20.1.2013.nptl/kernel/net/ipv4/netfilter/ipchains.o: insmod /lib/modules/2.4.20-20.1.2013.nptl/kernel/net/ipv4/netfilter/ipchains.o failed
/lib/modules/2.4.20-20.1.2013.nptl/kernel/net/ipv4/netfilter/ipchains.o: insmod ipt_MASQUERADE failed


which I assume means that ipchains has to be loaded too, but can't be since this is 2.4.x kernel. modules.dep has this:

modules/2.4.20-20.1.2013.nptl/kernel/net/ipv4/netfilter/ipt_MASQUERADE.o: /lib/modules/2.4.20-20.1.2013.nptl/kernel/net/ipv4/netfilter/ip_conntrack.o \
/lib/modules/2.4.20-20.1.2013.nptl/kernel/net/ipv4/netfilter/ipchains.o \
/lib/modules/2.4.20-20.1.2013.nptl/kernel/net/ipv4/netfilter/ip_tables.o



Any help would be really appreciated.


sean

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