firewall help

[Eric]

Hi

I'm followng the instructions at this week's issue of LinuxJournal.  They
have an article on how to set up the Net Filter firewall.  The address is
http://www2.linuxjournal.com/cgi-bin/frames.pl/index.html

The instructions say to do "modprobe ip_tables" to insert and then "lsmod |
grep ip_tables" to verify.  However, I cannot get past the first command.  I
receive an error.  Has anyone seen this error?  Can you tell me what it
means?  I rebooted and get the same message.  Here it is:

[root@Shitty /root]# modprobe ip_tables
/lib/modules/2.4.2-2/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
/lib/modules/2.4.2-2/kernel/net/ipv4/netfilter/ip_tables.o: insmod
/lib/modules/2.4.2-2/kernel/net/ipv4/netfilter/ip_tables.o failed
/lib/modules/2.4.2-2/kernel/net/ipv4/netfilter/ip_tables.o: insmod ip_tables
failed
[root@Shitty /root]#