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shorewall_code/Shorewall6/manpages/shorewall6-exclusion.xml

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN"
"http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd">
<refentry>
<refmeta>
<refentrytitle>shorewall6-exclusion</refentrytitle>
<manvolnum>5</manvolnum>
</refmeta>
<refnamediv>
<refname>exclusion</refname>
<refpurpose>Exclude a set of hosts from a definition in a shorewall6
configuration file.</refpurpose>
</refnamediv>
<refsynopsisdiv>
<cmdsynopsis>
<arg choice="plain"
rep="repeat"><option>!</option><replaceable>address-or-range</replaceable>[,<replaceable>address-or-range</replaceable>]</arg>
</cmdsynopsis>
<cmdsynopsis>
<arg choice="plain"
rep="repeat"><option>!</option><replaceable>zone-name</replaceable>[,<replaceable>zone-name</replaceable>]</arg>
</cmdsynopsis>
</refsynopsisdiv>
<refsect1>
<title>Description</title>
<para>Exclusion is used when you wish to exclude one or more addresses
from a definition. An exclaimation point is followed by a comma-separated
list of addresses. The addresses may be single host addresses (e.g.,
fe80::2a0:ccff:fedb:31c4) or they may be network addresses in CIDR format
(e.g., fe80::2a0:ccff:fedb:31c4/64). If your kernel and ip6tables include
iprange support, you may also specify ranges of ip addresses of the form
<emphasis>lowaddress</emphasis>-<emphasis>highaddress</emphasis></para>
<para>No embedded whitespace is allowed.</para>
<para>Exclusion can appear after a list of addresses and/or address
ranges. In that case, the final list of address is formed by taking the
first list and then removing the addresses defined in the
exclusion.</para>
<para>Beginning in Shorewall 4.4.13, the second form of exclusion is
allowed after <emphasis role="bold">all</emphasis> and <emphasis
role="bold">any</emphasis> in the SOURCE and DEST columns of
/etc/shorewall/rules. It allows you to omit arbitrary zones from the list
generated by those key words.</para>
<warning>
<para>If you omit a sub-zone and there is an explicit or explicit
CONTINUE policy, a connection to/from that zone can still be matched by
the rule generated for a parent zone.</para>
<para>For example:</para>
<blockquote>
<para>/etc/shorewall6/zones:</para>
<programlisting>#ZONE TYPE
z1 ip
z2:z1 ip
...</programlisting>
<para>/etc/shorewall6/policy:</para>
<programlisting>#SOURCE DEST POLICY
z1 net CONTINUE
z2 net REJECT</programlisting>
<para>/etc/shorewall6/rules:</para>
<programlisting>#ACTION SOURCE DEST PROTO DEST
# PORT(S)
ACCEPT all!z2 net tcp 22</programlisting>
<para>In this case, SSH connections from <emphasis
role="bold">z2</emphasis> to <emphasis role="bold">net</emphasis> will
be accepted by the generated <emphasis role="bold">z1</emphasis> to
net ACCEPT rule.</para>
</blockquote>
</warning>
</refsect1>
<refsect1>
<title>FILES</title>
<para>/etc/shorewall6/hosts</para>
<para>/etc/shorewall6/masq</para>
<para>/etc/shorewall6/rules</para>
<para>/etc/shorewall6/tcrules</para>
</refsect1>
<refsect1>
<title>See ALSO</title>
<para>shorewall6(8), shorewall6-accounting(5), shorewall6-actions(5),
shorewall6-blacklist(5), shorewall6-hosts(5), shorewall6-interfaces(5),
shorewall6-maclist(5), shoewall6-netmap(5),shorewall6-params(5), shorewall6-policy(5),
shorewall6-providers(5), shorewall6-rtrules(5),
2010-09-07 21:27:39 +02:00
shorewall6-routestopped(5), shorewall6-rules(5), shorewall6.conf(5), shorewall6-secmarks(5),
shorewall6-tcclasses(5), shorewall6-tcdevices(5), shorewall6-tcrules(5),
shorewall6-tos(5), shorewall6-tunnels(5), shorewall-zones(5)</para>
</refsect1>
</refentry>