Ip Masquerade problem on REDHAT 9

["A. John Peters" <ajpeters ajpconsult com>]

What does this mean

[root amdrh1 ajpeters]# /sbin/modprobe ipt_MASQUERADE
/lib/modules/2.4.20-6/kernel/net/ipv4/netfilter/ip_tables.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/2.4.20-6/kernel/net/ipv4/netfilter/ip_tables.o: insmod
/lib/modules/2.4.20-6/kernel/net/ipv4/netfilter/ip_tables.o failed
/lib/modules/2.4.20-6/kernel/net/ipv4/netfilter/ip_tables.o: insmod
ipt_MASQUERADE failed


This is my version of ip tables
[root amdrh1 ajpeters]# /sbin/iptables -V
iptables v1.2.7a

Insmod gives me this

[root amdrh1 ajpeters]# /sbin/insmod ipt_MASQUERADE -V
insmod version 2.4.22
Using /lib/modules/2.4.20-6/kernel/net/ipv4/netfilter/ipt_MASQUERADE.o
/lib/modules/2.4.20-6/kernel/net/ipv4/netfilter/ipt_MASQUERADE.o: unresolved
symbol ip_conntrack_get_R86a29bbf
/lib/modules/2.4.20-6/kernel/net/ipv4/netfilter/ipt_MASQUERADE.o: unresolved
symbol ipt_register_target_R089b8405
/lib/modules/2.4.20-6/kernel/net/ipv4/netfilter/ipt_MASQUERADE.o: unresolved
symbol ipt_unregister_target_R7ca95f0a
/lib/modules/2.4.20-6/kernel/net/ipv4/netfilter/ipt_MASQUERADE.o: unresolved
symbol ip_ct_selective_cleanup_R8e0950f6
/lib/modules/2.4.20-6/kernel/net/ipv4/netfilter/ipt_MASQUERADE.o: unresolved
symbol ip_nat_setup_info_R4e862227


If I have to install something or upgrade something, what is it and where do
I get it?