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Add Raw table to Netfilter Overview
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@ -57,26 +57,31 @@
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release.</emphasis></para>
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</caution>
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<important>
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<para><emphasis role="bold">Shorewall does not configure IPSEC for
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you</emphasis> -- it rather configures netfilter to accomodate your IPSEC
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configuration.</para>
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</important>
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<important>
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<para>The information in this article is only applicable if you plan to
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have IPSEC end-points on the same system where Shorewall is used.</para>
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</important>
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<important>
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<para>While this article shows configuration of IPSEC using ipsec-tools,
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Shorewall configuration is exactly the same when using OpenSwan or
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<para>While this <emphasis role="bold">article shows configuration of
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IPSEC using ipsec-tools</emphasis>, <emphasis role="bold">Shorewall
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configuration is exactly the same when using OpenSwan</emphasis> or
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FreeSwan.</para>
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</important>
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<warning>
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<para>When running a Linux kernel prior to 2.6.20, the Netfilter+ipsec and
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policy match support are broken when used with a bridge device. The
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problem has been reported to the responsible Netfilter developer who has
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confirmed the problem. The problem was corrected in Kernel 2.6.20 as a
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result of the removal of deferred FORWARD/OUTPUT processing of traffic
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destined for a bridge. See the <ulink
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url="bridge-Shorewall-perl.html">"<emphasis>Shorewall-perl and Bridged
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Firewalls</emphasis>"</ulink> article.</para>
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problem was corrected in Kernel 2.6.20 as a result of the removal of
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deferred FORWARD/OUTPUT processing of traffic destined for a bridge. See
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the <ulink url="bridge-Shorewall-perl.html">"<emphasis>Shorewall-perl and
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Bridged Firewalls</emphasis>"</ulink> article.</para>
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</warning>
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<section id="Overview">
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@ -132,12 +137,12 @@
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<para>Under the 2.4 Linux Kernel, the association of unencrypted traffic
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and zones was made easy by the presence of IPSEC pseudo-interfaces with
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names of the form <filename class="devicefile">ipsecn</filename> (e.g.
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names of the form <filename class="devicefile">ipsecN</filename> (e.g.
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<filename class="devicefile">ipsec0</filename>). Outgoing unencrypted
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traffic (case 1.) was send through an <filename
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class="devicefile">ipsecn</filename> device while incoming unencrypted
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class="devicefile">ipsecN</filename> device while incoming unencrypted
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traffic (case 2) arrived from an <filename
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class="devicefile">ipsecn</filename> device. The 2.6 kernel-based
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class="devicefile">ipsecN</filename> device. The 2.6 kernel-based
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implementation does away with these pseudo-interfaces. Outgoing traffic
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that is going to be encrypted and incoming traffic that has been decrypted
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must be matched against policies in the SPD and/or the appropriate
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@ -197,8 +197,7 @@ Chain POSTROUTING (policy ACCEPT 11579 packets, 771K bytes)
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Chain OUTPUT (policy ACCEPT 11579 packets, 771K bytes)
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pkts bytes target prot opt in out source destination</programlisting>
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<para>And finally, the <emphasis role="bold">Mangle</emphasis>
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table:</para>
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<para>Next, the <emphasis role="bold">Mangle</emphasis> table:</para>
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<programlisting>Mangle Table
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@ -231,6 +230,16 @@ Chain tcpost (1 references)
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pkts bytes target prot opt in out source destination
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Chain tcpre (1 references)
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pkts bytes target prot opt in out source destination</programlisting>
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<para>And finally, the <emphasis role="bold">Raw</emphasis> table:</para>
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<programlisting>Raw Table
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Chain PREROUTING (policy ACCEPT 1004K packets, 658M bytes)
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pkts bytes target prot opt in out source destination
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Chain OUTPUT (policy ACCEPT 926K packets, 186M bytes)
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pkts bytes target prot opt in out source destination</programlisting>
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</section>
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</article>
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