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Expand the description of 'noanycast' in shorewall-interfaces(5)

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Signed-off-by: Tom Eastep <teastep@shorewall.net>
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Tom Eastep 2020-09-09 12:33:01 -07:00
parent 6120eba8f9
commit 774be17a32
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1 changed files with 43 additions and 5 deletions
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48
Shorewall/manpages/shorewall-interfaces.xml
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@ -631,11 +631,49 @@ loc eth2 -</programlisting>
<term>noanycast</term>
<listitem>
<para>IPv6 only. Added in Shorewall 5.2.8. Shorewall6 normally
generates rules to silently drop anycast packets for subnets
on all available interfaces. This can be inhibited for
individual interfaces by specifying <emphasis
role="bold">noanycast</emphasis> for those interfaces.</para>
<para>IPv6 only. Added in Shorewall 5.2.8.</para>
<para>Shorewall6 has traditionally generated rules for IPv6
<emphasis>anycast</emphasis> addresses. These rules
include:</para>
<orderedlist numeration="loweralpha">
<listitem>
<para> Packets with these destination IP addresses are
dropped by REJECT rules.</para>
</listitem>
<listitem>
<para> Packets with these source IP addresses are dropped
by the 'nosmurfs' interface option and by the 'dropSmurfs'
action.</para>
</listitem>
<listitem>
<para>Packets with these destination IP addresses are not
logged during policy enforcement.</para>
</listitem>
<listitem>
<para>Packets with these destination IP addresses are
processes by the 'Broadcast' action.</para>
</listitem>
</orderedlist>
<para>This can be inhibited for individual interfaces by
specifying <emphasis role="bold">noanycast</emphasis> for
those interfaces.</para>
<note>
<para>RFC 2526 describes IPv6 subnet anycast addresses. The
RFC makes a distinction between subnets with "IPv6 address
types required to have 64-bit interface identifiers in
EUI-64 format" and all other subnets. When generating these
anycast addresses, the Shorewall compiler does not make this
distinction and unconditionally assumes that the last 128
addresses in the subnet are reserved as anycast
addresses.</para>
</note>
</listitem>
</varlistentry>