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335 lines
13 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN"
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"http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd">
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<refentry>
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<refmeta>
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<refentrytitle>shorewall-providers</refentrytitle>
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<manvolnum>5</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>providers</refname>
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<refpurpose>Shorewall Providers file</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<cmdsynopsis>
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<command>/etc/shorewall/providers</command>
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</cmdsynopsis>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para>This file is used to define additional routing tables. You will want
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to define an additional table if:</para>
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<itemizedlist>
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<listitem>
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<para>You have connections to more than one ISP or multiple
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connections to the same ISP</para>
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</listitem>
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<listitem>
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<para>You run Squid as a transparent proxy on a host other than the
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firewall.</para>
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</listitem>
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<listitem>
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<para>You have other requirements for policy routing.</para>
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</listitem>
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</itemizedlist>
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<para>Each entry in the file defines a single routing table.</para>
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<para>If you wish to omit a column entry but want to include an entry in
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the next column, use "-" for the omitted entry.</para>
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<para>The columns in the file are as follows.</para>
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<variablelist>
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<varlistentry>
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<term><emphasis role="bold">NAME</emphasis> -
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<emphasis>name</emphasis></term>
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<listitem>
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<para>The provider <emphasis>name</emphasis>. Must be a valid shell
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variable name. The names 'local', 'main', 'default' and 'unspec' are
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reserved and may not be used as provider names.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><emphasis role="bold">NUMBER</emphasis> -
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<emphasis>number</emphasis></term>
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<listitem>
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<para>The provider number -- a number between 1 and 15. Each
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provider must be assigned a unique value.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><emphasis role="bold">MARK</emphasis> (Optional) -
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<emphasis>value</emphasis></term>
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<listitem>
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<para>A FWMARK <emphasis>value</emphasis> used in your <ulink
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url="shorewall-tcrules.html">shorewall-tcrules(5)</ulink> file to
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direct packets to this provider.</para>
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<para>If HIGH_ROUTE_MARKS=Yes in <ulink
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url="shorewall.conf.html">shorewall.conf(5)</ulink>, then the value
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must be a multiple of 256 between 256 and 65280 or their hexadecimal
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equivalents (0x0100 and 0xff00 with the low-order byte of the value
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being zero). Otherwise, the value must be between 1 and 255. Each
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provider must be assigned a unique mark value. This column may be
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omitted if you don't use packet marking to direct connections to a
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particular provider and you don't specify <option>track</option> in
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the OPTIONS column.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><emphasis role="bold">DUPLICATE</emphasis> -
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<emphasis>routing-table-name</emphasis></term>
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<listitem>
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<para>The name of an existing table to duplicate to create this
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routing table. May be <option>main</option> or the name of a
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previously listed provider. You may select only certain entries from
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the table to copy by using the COPY column below. This column should
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contain a dash ("-') when USE_DEFAULT_RT=Yes in <ulink
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url="shorewall.conf.html">shorewall.conf(5)</ulink>.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><emphasis role="bold">INTERFACE</emphasis> -
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<emphasis>interface</emphasis>[:<emphasis>address</emphasis>]</term>
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<listitem>
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<para>The name of the network interface to the provider. Must be
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listed in <ulink
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url="shorewall-interfaces.html">shorewall-interfaces(5)</ulink>. In
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general, that interface should not have the
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<option>proxyarp</option> option specified unless
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<option>loose</option> is given in the OPTIONS column of this
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entry.</para>
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<para>Where more than one provider is serviced through a single
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interface, the <emphasis>interface</emphasis> must be followed by a
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colon and the IP <emphasis>address</emphasis> of the interface that
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is supplied by the associated provider.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><emphasis role="bold">GATEWAY</emphasis> - {<emphasis
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role="bold">-</emphasis>|<emphasis>address</emphasis>|<emphasis
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role="bold">detect</emphasis>}</term>
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<listitem>
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<para>The IP address of the provider's gateway router.</para>
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<para>You can enter "detect" here and Shorewall will attempt to
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detect the gateway automatically.</para>
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<para>For PPP devices, you may omit this column.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><emphasis role="bold">OPTIONS</emphasis> (Optional) - [<emphasis
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role="bold">-</emphasis>|<emphasis>option</emphasis>[<emphasis
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role="bold">,</emphasis><emphasis>option</emphasis>]...]</term>
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<listitem>
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<para>A comma-separated list selected from the following. The order
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of the options is not significant but the list may contain no
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embedded whitespace.</para>
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<variablelist>
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<varlistentry>
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<term><emphasis role="bold">track</emphasis></term>
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<listitem>
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<para>If specified, inbound connections on this interface are
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to be tracked so that responses may be routed back out this
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same interface.</para>
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<para>You want to specify <option>track</option> if internet
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hosts will be connecting to local servers through this
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provider.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><emphasis
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role="bold">balance[=<replaceable>weight</replaceable>]</emphasis></term>
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<listitem>
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<para>The providers that have <option>balance</option>
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specified will get outbound traffic load-balanced among them.
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By default, all interfaces with <option>balance</option>
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specified will have the same weight (1). You can change the
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weight of an interface by specifiying
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<option>balance=</option><replaceable>weight</replaceable>
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where <replaceable>weight</replaceable> is the weight of the
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route out of this interface.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><emphasis role="bold">loose</emphasis></term>
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<listitem>
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<para>Shorewall normally adds a routing rule for each IP
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address on an interface which forces traffic whose source is
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that IP address to be sent using the routing table for that
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interface. Setting <option>loose</option> prevents creation of
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such rules on this interface.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><emphasis role="bold">optional</emphasis></term>
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<listitem>
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<para>If the interface named in the INTERFACE column is not up
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and configured with an IPv4 address then ignore this provider.
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If not specified, the value of the <option>optional</option>
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option for the INTERFACE in <ulink
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url="shorewall-interfaces.html">shorewall-interfaces(5)</ulink>
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is assumed.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><emphasis
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role="bold">src=</emphasis><replaceable>source-address</replaceable></term>
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<listitem>
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<para>Added in Shorewall-perl 4.1.5. Specifies the source
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address to use when routing to this provider and none is known
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(the local client has bound to the 0 address). May not be
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specified when an <replaceable>address</replaceable> is given
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in the INTERFACE column. If this option is not used, Shorewall
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substitutes the primary IP address on the interface named in
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the INTERFACE column.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><emphasis
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role="bold">mtu=</emphasis><replaceable>number</replaceable></term>
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<listitem>
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<para>Added in Shorewall-perl 4.1.5. Specifies the MTU when
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forwarding through this provider. If not given, the MTU of the
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interface named in the INTERFACE column is assumed.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><emphasis
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role="bold">fallback[=<replaceable>weight</replaceable>]</emphasis></term>
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<listitem>
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<para>Added in Shorewall-perl 4.2.5. Indicates that a default
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route through the provider should be added to the default
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routing table (table 253). If a
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<replaceable>weight</replaceable> is given, a balanced route
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is added with the weight of this provider equal to the
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specified <replaceable>weight</replaceable>. If the option is
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given without a <replaceable>weight</replaceable>, an separate
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default route is added through the provider's gateway; the
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route has a metric equal to the provider's NUMBER. The option
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is ignored with a warning message if USE_DEFAULT_RT=Yes in
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<filename>shorewall.conf</filename>.</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><emphasis role="bold">COPY</emphasis> -
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[{<option>none</option>|<emphasis>interface</emphasis><emphasis
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role="bold">[,</emphasis><emphasis>interface</emphasis>]...}]</term>
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<listitem>
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<para>A comma-separated list of other interfaces on your firewall.
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Wildcards specified using an asterisk ("*") are permitted (e.g.,
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tun* ). Usually used only when DUPLICATE is <option>main</option>.
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Only copy routes through INTERFACE and through interfaces listed
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here. If you only wish to copy routes through INTERFACE, enter
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<option>none</option> in this column.</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1>
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<title>Examples</title>
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<variablelist>
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<varlistentry>
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<term>Example 1:</term>
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<listitem>
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<para>You run squid in your DMZ on IP address 192.168.2.99. Your DMZ
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interface is eth2</para>
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<programlisting> #NAME NUMBER MARK DUPLICATE INTERFACE GATEWAY OPTIONS
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Squid 1 1 - eth2 192.168.2.99 -</programlisting>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>Example 2:</term>
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<listitem>
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<para>eth0 connects to ISP 1. The IP address of eth0 is
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206.124.146.176 and the ISP's gateway router has IP address
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206.124.146.254.</para>
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<para>eth1 connects to ISP 2. The IP address of eth1 is
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130.252.99.27 and the ISP's gateway router has IP address
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130.252.99.254.</para>
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<para>eth2 connects to a local network.</para>
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<programlisting> #NAME NUMBER MARK DUPLICATE INTERFACE GATEWAY OPTIONS COPY
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ISP1 1 1 main eth0 206.124.146.254 track,balance eth2
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ISP2 2 2 main eth1 130.252.99.254 track,balance eth2</programlisting>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1>
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<title>FILES</title>
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<para>/etc/shorewall/providers</para>
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</refsect1>
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<refsect1>
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<title>See ALSO</title>
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<para><ulink
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url="http://shorewall.net/MultiISP.html">http://shorewall.net/MultiISP.html</ulink></para>
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<para>shorewall(8), shorewall-accounting(5), shorewall-actions(5),
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shorewall-blacklist(5), shorewall-hosts(5), shorewall-interfaces(5),
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shorewall-ipsec(5), shorewall-maclist(5), shorewall-masq(5),
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shorewall-nat(5), shorewall-netmap(5), shorewall-params(5),
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shorewall-policy(5), shorewall-proxyarp(5), shorewall-route_rules(5),
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shorewall-routestopped(5), shorewall-rules(5), shorewall.conf(5),
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shorewall-tcclasses(5), shorewall-tcdevices(5), shorewall-tcrules(5),
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shorewall-tos(5), shorewall-tunnels(5), shorewall-zones(5)</para>
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</refsect1>
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</refentry>
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