Which distro are you using? If it isn't an old 2.2 kernel, I would be surprised if the kernel didn't have a netfilter module, and if the system didn't have a package for ip_tables.
To answer your question; these are options that you set when using "make xconfig". These features need to be enabled. If they aren't, you need to compile a new kernel. If they are present, you don't.
Last edited by jschiwal; 04-19-2006 at 03:27 AM.
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