cant use iptable extensions

[d l]

Hi,
I am using vanilla Fedora Core 2, without configuring
firewall in anaconda during initial install.

Simple rules seems to works with built in modules. e.g. 
iptables -A INPUT -p ICMP -j DROP

However when I tried to use extension modules like
<connlimit> and <owner>, iptables always gives me error.

For <owner>:
iptables -m owner --help
.......
OWNER match v1.2.9 options:
[!] --uid-owner userid     Match local uid
[!] --gid-owner groupid    Match local gid
[!] --pid-owner processid  Match local pid
[!] --sid-owner sessionid  Match local sid
[!] --cmd-owner name       Match local command name

# iptables -A INPUT -m owner --cmd-owner mlnet -j test
iptables: Invalid argument

# iptables -m owner --cmd-owner
iptables v1.2.9: Unknown arg `--cmd-owner'
Try `iptables -h' or 'iptables --help' for more
information.

And similar results with <connlimit> extension.

There are corresponding so files in /lib/iptables for that
2 extensions.
/lib/iptables/libipt_connlimit.so
/lib/iptables/libipt_owner.so

So what is wrong with my iptables? It looks like that it
didn't load the extensions properly to me.

Any help is appreciated.

Regards,
Dil Lee

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