source: postlfs/security/iptables-kernel.xml

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<screen>[*] N<emphasis role='blue'>e</emphasis>tworking support ---&gt;                                                [NET]
  N<emphasis role='blue'>e</emphasis>tworking options ---&gt;
    [*] N<emphasis role='blue'>e</emphasis>twork packet filtering framework (Netfilter) ---&gt;          [NETFILTER]
      [*] <emphasis role='blue'>A</emphasis>dvanced netfilter configuration                  [NETFILTER_ADVANCED]
      <emphasis role='blue'>C</emphasis>ore Netfilter Configuration ---&gt;
        &lt;*/M&gt; N<emphasis role='blue'>e</emphasis>tfilter connection tracking support               [NF_CONNTRACK]
        &lt;*/M&gt; N<emphasis role='blue'>e</emphasis>tfilter Xtables support (required for ip_tables)
                                                        ...  [NETFILTER_XTABLES]
        &lt;*/M&gt;   <emphasis role='blue'>L</emphasis>OG target support                     [NETFILTER_XT_TARGET_LOG]
      <emphasis role='blue'>I</emphasis>P: Netfilter Configuration ---&gt;
        &lt;*/M&gt; <emphasis role='blue'>I</emphasis>P tables support (required for filtering/masq/NAT)
                                                           ...  [IP_NF_IPTABLES]</screen>