mirror of
https://gitlab.com/shorewall/code.git
synced 2024-12-30 10:08:52 +01:00
927 lines
37 KiB
XML
927 lines
37 KiB
XML
<?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>shorewall-interfaces</refentrytitle>
|
|
|
|
<manvolnum>5</manvolnum>
|
|
</refmeta>
|
|
|
|
<refnamediv>
|
|
<refname>interfaces</refname>
|
|
|
|
<refpurpose>Shorewall interfaces file</refpurpose>
|
|
</refnamediv>
|
|
|
|
<refsynopsisdiv>
|
|
<cmdsynopsis>
|
|
<command>/etc/shorewall/interfaces</command>
|
|
</cmdsynopsis>
|
|
</refsynopsisdiv>
|
|
|
|
<refsect1>
|
|
<title>Description</title>
|
|
|
|
<para>The interfaces file serves to define the firewall's network
|
|
interfaces to Shorewall. The order of entries in this file is not
|
|
significant in determining zone composition.</para>
|
|
|
|
<para>Beginning with Shorewall 4.5.3, the interfaces file supports two
|
|
different formats:</para>
|
|
|
|
<variablelist>
|
|
<varlistentry>
|
|
<term>FORMAT 1 (default - deprecated)</term>
|
|
|
|
<listitem>
|
|
<para>There is a BROADCAST column which can be used to specify the
|
|
broadcast address associated with the interface.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>FORMAT 2</term>
|
|
|
|
<listitem>
|
|
<para>The BROADCAST column is omitted.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
</variablelist>
|
|
|
|
<para>The format is specified by a line as follows:</para>
|
|
|
|
<blockquote>
|
|
<para><emphasis role="bold">[?]FORMAT {1|2}</emphasis></para>
|
|
</blockquote>
|
|
|
|
<para>The optional '?' was introduced in Shorewall 4.5.11 and ?FORMAT is
|
|
the preferred form; the form without the '?' is deprecated.</para>
|
|
|
|
<para>The columns in the file are as follows.</para>
|
|
|
|
<variablelist>
|
|
<varlistentry>
|
|
<term><emphasis role="bold">ZONE</emphasis> -
|
|
<emphasis>zone-name</emphasis></term>
|
|
|
|
<listitem>
|
|
<para>Zone for this interface. Must match the name of a zone
|
|
declared in /etc/shorewall/zones. You may not list the firewall zone
|
|
in this column.</para>
|
|
|
|
<para>If the interface serves multiple zones that will be defined in
|
|
the <ulink url="shorewall-hosts.html">shorewall-hosts</ulink>(5)
|
|
file, you should place "-" in this column.</para>
|
|
|
|
<para>If there are multiple interfaces to the same zone, you must
|
|
list them in separate entries.</para>
|
|
|
|
<para>Example:</para>
|
|
|
|
<blockquote>
|
|
<programlisting>#ZONE INTERFACE BROADCAST
|
|
loc eth1 -
|
|
loc eth2 -</programlisting>
|
|
</blockquote>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><emphasis role="bold">INTERFACE</emphasis> -
|
|
<emphasis>interface</emphasis><emphasis
|
|
role="bold">[:</emphasis><emphasis>port</emphasis><emphasis
|
|
role="bold">]</emphasis></term>
|
|
|
|
<listitem>
|
|
<para>Logical name of interface. Each interface may be listed only
|
|
once in this file. You may NOT specify the name of a "virtual"
|
|
interface (e.g., eth0:0) here; see <ulink
|
|
url="http://www.shorewall.net/FAQ.htm#faq18">http://www.shorewall.net/FAQ.htm#faq18</ulink>.
|
|
If the <option>physical</option> option is not specified, then the
|
|
logical name is also the name of the actual interface.</para>
|
|
|
|
<para>You may use wildcards here by specifying a prefix followed by
|
|
the plus sign ("+"). For example, if you want to make an entry that
|
|
applies to all PPP interfaces, use 'ppp+'; that would match ppp0,
|
|
ppp1, ppp2, … Please note that the '+' means '<emphasis
|
|
role="bold">one</emphasis> or more additional characters' so 'ppp'
|
|
does not match 'ppp+'.</para>
|
|
|
|
<para>When using Shorewall versions before 4.1.4, care must be
|
|
exercised when using wildcards where there is another zone that uses
|
|
a matching specific interface. See <ulink
|
|
url="shorewall-nesting.html">shorewall-nesting</ulink>(5) for a
|
|
discussion of this problem.</para>
|
|
|
|
<para>Shorewall allows '+' as an interface name.</para>
|
|
|
|
<para>There is no need to define the loopback interface (lo) in this
|
|
file.</para>
|
|
|
|
<para>If a <replaceable>port</replaceable> is given, then the
|
|
<replaceable>interface</replaceable> must have been defined
|
|
previously with the <option>bridge</option> option. The OPTIONS
|
|
column may not contain the following options when a
|
|
<replaceable>port</replaceable> is given.</para>
|
|
|
|
<simplelist>
|
|
<member>arp_filter</member>
|
|
|
|
<member>arp_ignore</member>
|
|
|
|
<member>bridge</member>
|
|
|
|
<member>log_martians</member>
|
|
|
|
<member>mss</member>
|
|
|
|
<member>optional</member>
|
|
|
|
<member>proxyarp</member>
|
|
|
|
<member>required</member>
|
|
|
|
<member>routefilter</member>
|
|
|
|
<member>sourceroute</member>
|
|
|
|
<member>upnp</member>
|
|
|
|
<member>wait</member>
|
|
</simplelist>
|
|
|
|
<para>Beginning with Shorewall 4.5.17, if you specify a zone for the
|
|
'lo' interface, then that zone must be defined as type
|
|
<option>local</option> in <ulink
|
|
url="shorewall6-zones.html">shorewall6-zones</ulink>(5).</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><emphasis role="bold">BROADCAST</emphasis> (Optional) -
|
|
{<emphasis role="bold">-</emphasis>|<emphasis
|
|
role="bold">detect</emphasis>|<emphasis>address</emphasis>[,<emphasis>address</emphasis>]...}</term>
|
|
|
|
<listitem>
|
|
<para>Only available if FORMAT 1.</para>
|
|
|
|
<para>If you use the special value <emphasis
|
|
role="bold">detect</emphasis>, Shorewall will detect the broadcast
|
|
address(es) for you if your iptables and kernel include Address Type
|
|
Match support.</para>
|
|
|
|
<para>If your iptables and/or kernel lack Address Type Match support
|
|
then you may list the broadcast address(es) for the network(s) to
|
|
which the interface belongs. For P-T-P interfaces, this column is
|
|
left blank. If the interface has multiple addresses on multiple
|
|
subnets then list the broadcast addresses as a comma-separated
|
|
list.</para>
|
|
|
|
<para>If you don't want to give a value for this column but you want
|
|
to enter a value in the OPTIONS column, enter <emphasis
|
|
role="bold">-</emphasis> in this column.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><emphasis role="bold">OPTIONS</emphasis> (Optional) -
|
|
[<emphasis>option</emphasis>[<emphasis
|
|
role="bold">,</emphasis><emphasis>option</emphasis>]...]</term>
|
|
|
|
<listitem>
|
|
<para>A comma-separated list of options from the following list. The
|
|
order in which you list the options is not significant but the list
|
|
should have no embedded white-space.</para>
|
|
|
|
<variablelist>
|
|
<varlistentry>
|
|
<term><emphasis role="bold">arp_filter[={0|1}]</emphasis></term>
|
|
|
|
<listitem>
|
|
<para>If specified, this interface will only respond to ARP
|
|
who-has requests for IP addresses configured on the interface.
|
|
If not specified, the interface can respond to ARP who-has
|
|
requests for IP addresses on any of the firewall's interface.
|
|
The interface must be up when Shorewall is started.</para>
|
|
|
|
<para>Only those interfaces with the
|
|
<option>arp_filter</option> option will have their setting
|
|
changed; the value assigned to the setting will be the value
|
|
specified (if any) or 1 if no value is given.</para>
|
|
|
|
<para></para>
|
|
|
|
<note>
|
|
<para>This option does not work with a wild-card
|
|
<replaceable>interface</replaceable> name (e.g., eth0.+) in
|
|
the INTERFACE column.</para>
|
|
</note>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><emphasis
|
|
role="bold">arp_ignore</emphasis>[=<emphasis>number</emphasis>]</term>
|
|
|
|
<listitem>
|
|
<para>If specified, this interface will respond to arp
|
|
requests based on the value of <emphasis>number</emphasis>
|
|
(defaults to 1).</para>
|
|
|
|
<para>1 - reply only if the target IP address is local address
|
|
configured on the incoming interface</para>
|
|
|
|
<para>2 - reply only if the target IP address is local address
|
|
configured on the incoming interface and the sender's IP
|
|
address is part from same subnet on this interface's
|
|
address</para>
|
|
|
|
<para>3 - do not reply for local addresses configured with
|
|
scope host, only resolutions for global and link</para>
|
|
|
|
<para>4-7 - reserved</para>
|
|
|
|
<para>8 - do not reply for all local addresses</para>
|
|
|
|
<para></para>
|
|
|
|
<note>
|
|
<para>This option does not work with a wild-card
|
|
<replaceable>interface</replaceable> name (e.g., eth0.+) in
|
|
the INTERFACE column.</para>
|
|
</note>
|
|
|
|
<para></para>
|
|
|
|
<warning>
|
|
<para>Do not specify <emphasis
|
|
role="bold">arp_ignore</emphasis> for any interface involved
|
|
in <ulink url="../ProxyARP.htm">Proxy ARP</ulink>.</para>
|
|
</warning>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><emphasis role="bold">blacklist</emphasis></term>
|
|
|
|
<listitem>
|
|
<para>Checks packets arriving on this interface against the
|
|
<ulink
|
|
url="shorewall-blacklist.html">shorewall-blacklist</ulink>(5)
|
|
file.</para>
|
|
|
|
<para>Beginning with Shorewall 4.4.13:</para>
|
|
|
|
<itemizedlist>
|
|
<listitem>
|
|
<para>If a <replaceable>zone</replaceable> is given in the
|
|
ZONES column, then the behavior is as if <emphasis
|
|
role="bold">blacklist</emphasis> had been specified in the
|
|
IN_OPTIONS column of <ulink
|
|
url="shorewall-zones.html">shorewall-zones</ulink>(5).</para>
|
|
</listitem>
|
|
|
|
<listitem>
|
|
<para>Otherwise, the option is ignored with a
|
|
warning:</para>
|
|
|
|
<blockquote>
|
|
<para><emphasis role="bold">WARNING: The 'blacklist'
|
|
option is ignored on multi-zone
|
|
interfaces</emphasis></para>
|
|
</blockquote>
|
|
</listitem>
|
|
</itemizedlist>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><emphasis role="bold">bridge</emphasis></term>
|
|
|
|
<listitem>
|
|
<para>Designates the interface as a bridge. Beginning with
|
|
Shorewall 4.4.7, setting this option also sets
|
|
<option>routeback</option>.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><emphasis role="bold">destonly</emphasis></term>
|
|
|
|
<listitem>
|
|
<para>Added in Shorewall 4.5.17. Causes the compiler to omit
|
|
rules to handle traffic from this interface.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><emphasis role="bold">dhcp</emphasis></term>
|
|
|
|
<listitem>
|
|
<para>Specify this option when any of the following are
|
|
true:</para>
|
|
|
|
<orderedlist spacing="compact">
|
|
<listitem>
|
|
<para>the interface gets its IP address via DHCP</para>
|
|
</listitem>
|
|
|
|
<listitem>
|
|
<para>the interface is used by a DHCP server running on
|
|
the firewall</para>
|
|
</listitem>
|
|
|
|
<listitem>
|
|
<para>the interface has a static IP but is on a LAN
|
|
segment with lots of DHCP clients.</para>
|
|
</listitem>
|
|
|
|
<listitem>
|
|
<para>the interface is a <ulink
|
|
url="../SimpleBridge.html">simple bridge</ulink> with a
|
|
DHCP server on one port and DHCP clients on another
|
|
port.</para>
|
|
|
|
<note>
|
|
<para>If you use <ulink
|
|
url="../bridge-Shorewall-perl.html">Shorewall-perl for
|
|
firewall/bridging</ulink>, then you need to include
|
|
DHCP-specific rules in <ulink
|
|
url="shorewall-rules.html">shorewall-rules</ulink>(8).
|
|
DHCP uses UDP ports 67 and 68.</para>
|
|
</note>
|
|
</listitem>
|
|
</orderedlist>
|
|
|
|
<para>This option allows DHCP datagrams to enter and leave the
|
|
interface.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><emphasis role="bold">ignore[=1]</emphasis></term>
|
|
|
|
<listitem>
|
|
<para>When specified, causes the generated script to ignore
|
|
up/down events from Shorewall-init for this device.
|
|
Additionally, the option exempts the interface from hairpin
|
|
filtering. When '=1' is omitted, the ZONE column must contain
|
|
'-' and <option>ignore</option> must be the only
|
|
OPTION.</para>
|
|
|
|
<para>Beginning with Shorewall 4.5.5, may be specified as
|
|
'<option>ignore=1</option>' which only causes the generated
|
|
script to ignore up/down events from Shorewall-init; hairpin
|
|
filtering is still applied. In this case, the above
|
|
restrictions on the ZONE and OPTIONS columns are
|
|
lifted.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><emphasis
|
|
role="bold">logmartians[={0|1}]</emphasis></term>
|
|
|
|
<listitem>
|
|
<para>Turn on kernel martian logging (logging of packets with
|
|
impossible source addresses. It is strongly suggested that if
|
|
you set <emphasis role="bold">routefilter</emphasis> on an
|
|
interface that you also set <emphasis
|
|
role="bold">logmartians</emphasis>. Even if you do not specify
|
|
the <option>routefilter</option> option, it is a good idea to
|
|
specify <option>logmartians</option> because your distribution
|
|
may have enabled route filtering without you knowing
|
|
it.</para>
|
|
|
|
<para>Only those interfaces with the
|
|
<option>logmartians</option> option will have their setting
|
|
changed; the value assigned to the setting will be the value
|
|
specified (if any) or 1 if no value is given.</para>
|
|
|
|
<para>To find out if route filtering is set on a given
|
|
<replaceable>interface</replaceable>, check the contents of
|
|
<filename>/proc/sys/net/ipv4/conf/<replaceable>interface</replaceable>/rp_filter</filename>
|
|
- a non-zero value indicates that route filtering is
|
|
enabled.</para>
|
|
|
|
<para>Example:</para>
|
|
|
|
<programlisting> teastep@lists:~$ <command>cat /proc/sys/net/ipv4/conf/eth0/rp_filter </command>
|
|
1
|
|
teastep@lists:~$ </programlisting>
|
|
|
|
<para></para>
|
|
|
|
<note>
|
|
<para>This option does not work with a wild-card
|
|
<replaceable>interface</replaceable> name (e.g., eth0.+) in
|
|
the INTERFACE column.</para>
|
|
</note>
|
|
|
|
<blockquote>
|
|
<para>This option may also be enabled globally in the <ulink
|
|
url="shorewall.conf.html">shorewall.conf</ulink>(5)
|
|
file.</para>
|
|
</blockquote>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><emphasis role="bold">maclist</emphasis></term>
|
|
|
|
<listitem>
|
|
<para>Connection requests from this interface are compared
|
|
against the contents of <ulink
|
|
url="shorewall-maclist.html">shorewall-maclist</ulink>(5). If
|
|
this option is specified, the interface must be an Ethernet
|
|
NIC and must be up before Shorewall is started.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><emphasis
|
|
role="bold">mss</emphasis>=<emphasis>number</emphasis></term>
|
|
|
|
<listitem>
|
|
<para>Added in Shorewall 4.0.3. Causes forwarded TCP SYN
|
|
packets entering or leaving on this interface to have their
|
|
MSS field set to the specified
|
|
<replaceable>number</replaceable>.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><emphasis
|
|
role="bold">nets=(<emphasis>net</emphasis>[,...])</emphasis></term>
|
|
|
|
<listitem>
|
|
<para>Limit the zone named in the ZONE column to only the
|
|
listed networks. The parentheses may be omitted if only a
|
|
single <replaceable>net</replaceable> is given (e.g.,
|
|
nets=192.168.1.0/24). Limited broadcast to the zone is
|
|
supported. Beginning with Shorewall 4.4.1, multicast traffic
|
|
to the zone is also supported.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><emphasis role="bold">nets=dynamic</emphasis></term>
|
|
|
|
<listitem>
|
|
<para>Defines the zone as <firstterm>dynamic</firstterm>.
|
|
Requires ipset match support in your iptables and kernel. See
|
|
<ulink
|
|
url="http://www.shorewall.net/Dynamic.html">http://www.shorewall.net/Dynamic.html</ulink>
|
|
for further information.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><emphasis role="bold">nosmurfs</emphasis></term>
|
|
|
|
<listitem>
|
|
<para>Filter packets for smurfs (packets with a broadcast
|
|
address as the source).</para>
|
|
|
|
<para>Smurfs will be optionally logged based on the setting of
|
|
SMURF_LOG_LEVEL in <ulink
|
|
url="shorewall.conf.html">shorewall.conf</ulink>(5). After
|
|
logging, the packets are dropped.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><emphasis role="bold">optional</emphasis></term>
|
|
|
|
<listitem>
|
|
<para>When <option>optional</option> is specified for an
|
|
interface, Shorewall will be silent when:</para>
|
|
|
|
<itemizedlist>
|
|
<listitem>
|
|
<para>a <filename
|
|
class="directory">/proc/sys/net/ipv4/conf/</filename>
|
|
entry for the interface cannot be modified (including for
|
|
proxy ARP).</para>
|
|
</listitem>
|
|
|
|
<listitem>
|
|
<para>The first address of the interface cannot be
|
|
obtained.</para>
|
|
</listitem>
|
|
</itemizedlist>
|
|
|
|
<para>May not be specified with <emphasis
|
|
role="bold">required</emphasis>.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><emphasis role="bold">physical</emphasis>=<emphasis
|
|
role="bold"><emphasis>name</emphasis></emphasis></term>
|
|
|
|
<listitem>
|
|
<para>Added in Shorewall 4.4.4. When specified, the interface
|
|
or port name in the INTERFACE column is a logical name that
|
|
refers to the name given in this option. It is useful when you
|
|
want to specify the same wildcard port name on two or more
|
|
bridges. See <ulink
|
|
url="http://www.shorewall.net/bridge-Shorewall-perl.html#Multiple">http://www.shorewall.net/bridge-Shorewall-perl.html#Multiple</ulink>.</para>
|
|
|
|
<para>If the <emphasis>interface</emphasis> name is a wildcard
|
|
name (ends with '+'), then the physical
|
|
<emphasis>name</emphasis> must also end in '+'.</para>
|
|
|
|
<para>If <option>physical</option> is not specified, then it's
|
|
value defaults to the <emphasis>interface</emphasis>
|
|
name.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><emphasis role="bold">proxyarp[={0|1}]</emphasis></term>
|
|
|
|
<listitem>
|
|
<para>Sets
|
|
/proc/sys/net/ipv4/conf/<emphasis>interface</emphasis>/proxy_arp.
|
|
Do NOT use this option if you are employing Proxy ARP through
|
|
entries in <ulink
|
|
url="shorewall-proxyarp.html">shorewall-proxyarp</ulink>(5).
|
|
This option is intended solely for use with Proxy ARP
|
|
sub-networking as described at: <ulink
|
|
url="http://tldp.org/HOWTO/Proxy-ARP-Subnet/index.html">http://tldp.org/HOWTO/Proxy-ARP-Subnet/index.html.
|
|
</ulink></para>
|
|
|
|
<para><emphasis role="bold">Note</emphasis>: This option does
|
|
not work with a wild-card <replaceable>interface</replaceable>
|
|
name (e.g., eth0.+) in the INTERFACE column.</para>
|
|
|
|
<para>Only those interfaces with the <option>proxyarp</option>
|
|
option will have their setting changed; the value assigned to
|
|
the setting will be the value specified (if any) or 1 if no
|
|
value is given.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><emphasis role="bold">required</emphasis></term>
|
|
|
|
<listitem>
|
|
<para>Added in Shorewall 4.4.10. If this option is set, the
|
|
firewall will fail to start if the interface is not usable.
|
|
May not be specified together with <emphasis
|
|
role="bold">optional</emphasis>.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><emphasis role="bold">routeback[={0|1}]</emphasis></term>
|
|
|
|
<listitem>
|
|
<para>If specified, indicates that Shorewall should include
|
|
rules that allow traffic arriving on this interface to be
|
|
routed back out that same interface. This option is also
|
|
required when you have used a wildcard in the INTERFACE column
|
|
if you want to allow traffic between the interfaces that match
|
|
the wildcard.</para>
|
|
|
|
<para>Beginning with Shorewall 4.4.20, if you specify this
|
|
option, then you should also specify either
|
|
<option>sfilter</option> (see below) or
|
|
<option>routefilter</option> on all interfaces (see
|
|
below).</para>
|
|
|
|
<para>Beginning with Shorewall 4.5.18, you may specify this
|
|
option to explicitly reset (e.g., <emphasis
|
|
role="bold">routeback=0</emphasis>). This can be used to
|
|
override Shorewall's default setting for bridge devices which
|
|
is <emphasis role="bold">routeback=1</emphasis>.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><emphasis
|
|
role="bold">routefilter[={0|1|2}]</emphasis></term>
|
|
|
|
<listitem>
|
|
<para>Turn on kernel route filtering for this interface
|
|
(anti-spoofing measure).</para>
|
|
|
|
<para>Only those interfaces with the
|
|
<option>routefilter</option> option will have their setting
|
|
changes; the value assigned to the setting will be the value
|
|
specified (if any) or 1 if no value is given.</para>
|
|
|
|
<para>The value 2 is only available with Shorewall 4.4.5.1 and
|
|
later when the kernel version is 2.6.31 or later. It specifies
|
|
a <firstterm>loose</firstterm> form of reverse path
|
|
filtering.</para>
|
|
|
|
<note>
|
|
<para>This option does not work with a wild-card
|
|
<replaceable>interface</replaceable> name (e.g., eth0.+) in
|
|
the INTERFACE column.</para>
|
|
</note>
|
|
|
|
<para>This option can also be enabled globally via the
|
|
ROUTE_FILTER option in the <ulink
|
|
url="shorewall.conf.html">shorewall.conf</ulink>(5)
|
|
file.</para>
|
|
|
|
<important>
|
|
<para>If ROUTE_FILTER=Yes in <ulink
|
|
url="shorewall.conf.html">shorewall.conf</ulink>(5), or if
|
|
your distribution sets net.ipv4.conf.all.rp_filter=1 in
|
|
<filename>/etc/sysctl.conf</filename>, then setting
|
|
<emphasis role="bold">routefilter</emphasis>=0 in an
|
|
<replaceable>interface</replaceable> entry will not disable
|
|
route filtering on that
|
|
<replaceable>interface</replaceable>! The effective setting
|
|
for an <replaceable>interface</replaceable> is the maximum
|
|
of the contents of
|
|
<filename>/proc/sys/net/ipv4/conf/all/rp_filter</filename>
|
|
and the routefilter setting specified in this file
|
|
(/proc/sys/net/ipv4/conf/<replaceable>interface</replaceable>/rp_filter).</para>
|
|
</important>
|
|
|
|
<note>
|
|
<para>There are certain cases where
|
|
<option>routefilter</option> cannot be used on an
|
|
interface:</para>
|
|
|
|
<itemizedlist>
|
|
<listitem>
|
|
<para>If USE_DEFAULT_RT=Yes in <ulink
|
|
url="shorewall.conf.html">shorewall.conf</ulink>(5) and
|
|
the interface is listed in <ulink
|
|
url="shorewall-providers.html">shorewall-providers</ulink>(5).</para>
|
|
</listitem>
|
|
|
|
<listitem>
|
|
<para>If there is an entry for the interface in <ulink
|
|
url="shorewall-providers.html">shorewall-providers</ulink>(5)
|
|
that doesn't specify the <option>balance</option>
|
|
option.</para>
|
|
</listitem>
|
|
|
|
<listitem>
|
|
<para>If IPSEC is used to allow a road-warrior to have a
|
|
local address, then any interface through which the
|
|
road-warrior might connect cannot specify
|
|
<option>routefilter</option>.</para>
|
|
</listitem>
|
|
</itemizedlist>
|
|
</note>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><emphasis role="bold">rpfilter</emphasis></term>
|
|
|
|
<listitem>
|
|
<para>Added in Shorewall 4.5.7. This is an anti-spoofing
|
|
measure that requires the 'RPFilter Match' capability in your
|
|
iptables and kernel. It provides a more efficient alternative
|
|
to the <option>sfilter</option> option below. It performs a
|
|
function similar to <option>routefilter</option> (see above)
|
|
but works with Multi-ISP configurations that do now use
|
|
balanced routes.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><emphasis
|
|
role="bold">sfilter=(<emphasis>net</emphasis>[,...])</emphasis></term>
|
|
|
|
<listitem>
|
|
<para>Added in Shorewall 4.4.20. This option provides an
|
|
anti-spoofing alternative to <option>routefilter</option> on
|
|
interfaces where that option cannot be used, but where the
|
|
<option>routeback</option> option is required (on a bridge,
|
|
for example). On these interfaces, <option>sfilter</option>
|
|
should list those local networks that are connected to the
|
|
firewall through other interfaces.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><emphasis
|
|
role="bold">sourceroute[={0|1}]</emphasis></term>
|
|
|
|
<listitem>
|
|
<para>If this option is not specified for an interface, then
|
|
source-routed packets will not be accepted from that interface
|
|
unless it has been explicitly enabled via sysconf. Only set
|
|
this option to 1 (enable source routing) if you know what you
|
|
are doing. This might represent a security risk and is usually
|
|
unneeded.</para>
|
|
|
|
<para>Only those interfaces with the
|
|
<option>sourceroute</option> option will have their setting
|
|
changed; the value assigned to the setting will be the value
|
|
specified (if any) or 1 if no value is given.</para>
|
|
|
|
<note>
|
|
<para>This option does not work with a wild-card
|
|
<replaceable>interface</replaceable> name (e.g., eth0.+) in
|
|
the INTERFACE column.</para>
|
|
</note>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><emphasis role="bold">tcpflags</emphasis></term>
|
|
|
|
<listitem>
|
|
<para>Packets arriving on this interface are checked for
|
|
certain illegal combinations of TCP flags. Packets found to
|
|
have such a combination of flags are handled according to the
|
|
setting of TCP_FLAGS_DISPOSITION after having been logged
|
|
according to the setting of TCP_FLAGS_LOG_LEVEL.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>unmanaged</term>
|
|
|
|
<listitem>
|
|
<para>Added in Shorewall 4.5.18. Causes all traffic between
|
|
the firewall and hosts on the interface to be accepted. When
|
|
this option is given:</para>
|
|
|
|
<itemizedlist>
|
|
<listitem>
|
|
<para>The ZONE column must contain '-'.</para>
|
|
</listitem>
|
|
|
|
<listitem>
|
|
<para>Only the following other options are allowed with
|
|
<emphasis role="bold">unmanaged</emphasis>:</para>
|
|
|
|
<simplelist>
|
|
<member><emphasis
|
|
role="bold">arp_filter</emphasis></member>
|
|
|
|
<member><emphasis
|
|
role="bold">arp_ignore</emphasis></member>
|
|
|
|
<member><emphasis role="bold">ignore</emphasis></member>
|
|
|
|
<member><emphasis
|
|
role="bold">routefilter</emphasis></member>
|
|
|
|
<member><emphasis
|
|
role="bold">optional</emphasis></member>
|
|
|
|
<member><emphasis
|
|
role="bold">physical</emphasis></member>
|
|
|
|
<member><emphasis
|
|
role="bold">routefilter</emphasis></member>
|
|
|
|
<member><emphasis
|
|
role="bold">sourceroute</emphasis></member>
|
|
|
|
<member><emphasis
|
|
role="bold">proxyndp</emphasis></member>
|
|
</simplelist>
|
|
</listitem>
|
|
</itemizedlist>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><emphasis role="bold">upnp</emphasis></term>
|
|
|
|
<listitem>
|
|
<para>Incoming requests from this interface may be remapped
|
|
via UPNP (upnpd). See <ulink
|
|
url="../UPnP.html">http://www.shorewall.net/UPnP.html</ulink>.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><emphasis role="bold">upnpclient</emphasis></term>
|
|
|
|
<listitem>
|
|
<para>This option is intended for laptop users who always run
|
|
Shorewall on their system yet need to run UPnP-enabled client
|
|
apps such as Transmission (BitTorrent client). The option
|
|
causes Shorewall to detect the default gateway through the
|
|
interface and to accept UDP packets from that gateway. Note
|
|
that, like all aspects of UPnP, this is a security hole so use
|
|
this option at your own risk.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><emphasis
|
|
role="bold">wait</emphasis>=<emphasis>seconds</emphasis></term>
|
|
|
|
<listitem>
|
|
<para>Added in Shorewall 4.4.10. Causes the generated script
|
|
to wait up to <emphasis>seconds</emphasis> seconds for the
|
|
interface to become usable before applying the <emphasis
|
|
role="bold">required</emphasis> or <emphasis
|
|
role="bold">optional</emphasis> options.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
</variablelist>
|
|
</listitem>
|
|
</varlistentry>
|
|
</variablelist>
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
<title>Example</title>
|
|
|
|
<variablelist>
|
|
<varlistentry>
|
|
<term>Example 1:</term>
|
|
|
|
<listitem>
|
|
<para>Suppose you have eth0 connected to a DSL modem and eth1
|
|
connected to your local network and that your local subnet is
|
|
192.168.1.0/24. The interface gets its IP address via DHCP from
|
|
subnet 206.191.149.192/27. You have a DMZ with subnet 192.168.2.0/24
|
|
using eth2. Your iptables and/or kernel do not support "Address Type
|
|
Match" and you prefer to specify broadcast addresses explicitly
|
|
rather than having Shorewall detect them.</para>
|
|
|
|
<para>Your entries for this setup would look like:</para>
|
|
|
|
<programlisting>FORMAT 1
|
|
#ZONE INTERFACE BROADCAST OPTIONS
|
|
net eth0 206.191.149.223 dhcp
|
|
loc eth1 192.168.1.255
|
|
dmz eth2 192.168.2.255</programlisting>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>Example 2:</term>
|
|
|
|
<listitem>
|
|
<para>The same configuration without specifying broadcast addresses
|
|
is:</para>
|
|
|
|
<programlisting>FORMAT 2
|
|
#ZONE INTERFACE OPTIONS
|
|
net eth0 dhcp
|
|
loc eth1
|
|
dmz eth2</programlisting>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>Example 3:</term>
|
|
|
|
<listitem>
|
|
<para>You have a simple dial-in system with no Ethernet
|
|
connections.</para>
|
|
|
|
<programlisting>FORMAT 2
|
|
#ZONE INTERFACE OPTIONS
|
|
net ppp0 -</programlisting>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>Example 4 (Shorewall 4.4.9 and later):</term>
|
|
|
|
<listitem>
|
|
<para>You have a bridge with no IP address and you want to allow
|
|
traffic through the bridge.</para>
|
|
|
|
<programlisting>FORMAT 2
|
|
#ZONE INTERFACE OPTIONS
|
|
- br0 routeback</programlisting>
|
|
</listitem>
|
|
</varlistentry>
|
|
</variablelist>
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
<title>FILES</title>
|
|
|
|
<para>/etc/shorewall/interfaces</para>
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
<title>See ALSO</title>
|
|
|
|
<para><ulink
|
|
url="http://shorewall.net/configuration_file_basics.htm#Pairs">http://shorewall.net/configuration_file_basics.htm#Pairs</ulink></para>
|
|
|
|
<para>shorewall(8), shorewall-accounting(5), shorewall-actions(5),
|
|
shorewall-blacklist(5), shorewall-hosts(5), shorewall-maclist(5),
|
|
shorewall-masq(5), shorewall-nat(5), shorewall-netmap(5),
|
|
shorewall-params(5), shorewall-policy(5), shorewall-providers(5),
|
|
shorewall-proxyarp(5), shorewall-rtrules(5), shorewall-routestopped(5),
|
|
shorewall-rules(5), shorewall.conf(5), shorewall-secmarks(5),
|
|
shorewall-tcclasses(5), shorewall-tcdevices(5), shorewall-tcrules(5),
|
|
shorewall-tos(5), shorewall-tunnels(5), shorewall-zones(5)</para>
|
|
</refsect1>
|
|
</refentry>
|