shorewall_code/Shorewall/manpages/shorewall-tcdevices.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>shorewall-tcdevices</refentrytitle>
<manvolnum>5</manvolnum>
<refmiscinfo>Configuration Files</refmiscinfo>
</refmeta>
<refnamediv>
<refname>tcdevices</refname>
<refpurpose>Shorewall Traffic Shaping Devices file</refpurpose>
</refnamediv>
<refsynopsisdiv>
<cmdsynopsis>
<command>/etc/shorewall[6]/tcdevices</command>
</cmdsynopsis>
</refsynopsisdiv>
<refsect1>
<title>Description</title>
<para>Entries in this file define the bandwidth for interfaces on which
you want traffic shaping to be enabled.</para>
<para>If you do not plan to use traffic shaping for a device, don't put it
in here as it limits the throughput of that device to the limits you set
here.</para>
<para>A note on the <emphasis>bandwidth</emphasis> definitions used in
this file:</para>
<itemizedlist>
<listitem>
<para>don't use a space between the integer value and the unit: 30kbit
is valid while 30 kbit is not.</para>
</listitem>
<listitem>
<para>you can use one of the following units:</para>
<variablelist>
<varlistentry>
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<term><emphasis role="bold">kbps</emphasis></term>
<listitem>
<para>Kilobytes per second.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><emphasis role="bold">mbps</emphasis></term>
<listitem>
<para>Megabytes per second.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><emphasis role="bold">kbit</emphasis></term>
<listitem>
<para>Kilobits per second.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><emphasis role="bold">mbit</emphasis></term>
<listitem>
<para>Megabits per second.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><emphasis role="bold">bps</emphasis> or <emphasis
role="bold">number</emphasis></term>
<listitem>
<para>Bytes per second.</para>
</listitem>
</varlistentry>
</variablelist>
</listitem>
<listitem>
<para>Only whole integers are allowed.</para>
</listitem>
</itemizedlist>
<para>The columns in the file are as follows (where the column name is
followed by a different name in parentheses, the different name is used in
the alternate specification syntax).</para>
<variablelist>
<varlistentry>
<term><emphasis role="bold">INTERFACE</emphasis> -
[<emphasis>number</emphasis>:]<emphasis>interface</emphasis></term>
<listitem>
<para>Name of <emphasis>interface</emphasis>. Each interface may be
listed only once in this file. You may NOT specify the name of an
alias (e.g., eth0:0) here; see <ulink
url="../FAQ.htm#faq18">https://shorewall.org/FAQ.htm#faq18</ulink></para>
<para>You may NOT specify wildcards here, e.g. if you have multiple
ppp interfaces, you need to put them all in here!</para>
<para>If the device doesn't exist, a warning message will be issued
during "shorewall [re]start" and "shorewall reload" and traffic
shaping configuration will be skipped for that device.</para>
<para>Shorewall assigns a sequential <firstterm>interface
number</firstterm> to each interface (the first entry in the file is
interface 1, the second is interface 2 and so on) You can explicitly
specify the interface number by prefixing the interface name with
the number and a colon (":"). Example: 1:eth0.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><emphasis role="bold">IN-BANDWIDTH (in_bandwidth)</emphasis> -
{-|<replaceable>bandwidth</replaceable>[:<replaceable>burst</replaceable>]|~<replaceable>bandwidth</replaceable>[:<replaceable>interval</replaceable>:<replaceable>decay_interval</replaceable>]}</term>
<listitem>
<para>The incoming <emphasis>bandwidth</emphasis> of that interface.
Please note that you are not able to do traffic shaping on incoming
traffic, as the traffic is already received before you could do so.
But this allows you to define the maximum traffic allowed for this
interface in total, if the rate is exceeded, the packets are
dropped. You want this mainly if you have a DSL or Cable connection
to avoid queuing at your providers side.</para>
<para>If you don't want any traffic to be dropped, set this to a
value to zero in which case Shorewall will not create an ingress
qdisc.Must be set to zero if the REDIRECTED INTERFACES column is
non-empty.</para>
<para>The optional burst option was added in Shorewall 4.4.18. The
default <replaceable>burst</replaceable> is 10kb. A larger
<replaceable>burst</replaceable> can help make the
<replaceable>bandwidth</replaceable> more accurate; often for fast
lines, the enforced rate is well below the specified
<replaceable>bandwidth</replaceable>.</para>
<para>What is described above creates a rate/burst policing filter.
Beginning with Shorewall 4.4.25, a rate-estimated policing filter
may be configured instead. Rate-estimated filters should be used
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with Ethernet adapters that have Generic Receive Offload enabled by
default. See <ulink url="../FAQ.htm#faq97a">Shorewall FAQ
97a</ulink>.</para>
<para>To create a rate-estimated filter, precede the bandwidth with
a tilde ("~"). The optional interval and decay_interval determine
how often the rate is estimated and how many samples are retained
for estimating. Please see <ulink
url="http://ace-host.stuart.id.au/russell/files/tc/doc/estimators.txt">http://ace-host.stuart.id.au/russell/files/tc/doc/estimators.txt</ulink>
for details. If not specified, the default
<replaceable>interval</replaceable> is 250ms and the default
<replaceable>decay_interval</replaceable> is 4sec.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><emphasis role="bold">OUT-BANDWIDTH</emphasis> (out_bandwidth) -
<emphasis>bandwidth</emphasis></term>
<listitem>
<para>The outgoing <emphasis>bandwidth</emphasis> of that interface.
This is the maximum speed your connection can handle. It is also the
speed you can refer as "full" if you define the tc classes in <ulink
url="shorewall-tcclasses.html">shorewall-tcclasses</ulink>(5).
Outgoing traffic above this rate will be dropped.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><emphasis role="bold">OPTIONS</emphasis> - {<emphasis
role="bold">-</emphasis>|<emphasis
role="bold">{classify</emphasis>|<emphasis
role="bold">htb|hfsc</emphasis>|<emphasis
role="bold">linklayer</emphasis>={<emphasis
role="bold">ethernet</emphasis>|<emphasis
role="bold">atm</emphasis>|<emphasis
role="bold">adsl</emphasis>}|<emphasis
role="bold">tsize</emphasis>=<replaceable>tsize</replaceable>|<emphasis
role="bold">mtu</emphasis>=<replaceable>mtu</replaceable>|<emphasis
role="bold">mpu</emphasis>=<replaceable>mpu</replaceable>|<emphasis
role="bold">overhead</emphasis>=<replaceable>overhead</replaceable>}
,...}</term>
<listitem>
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<para><option>classify</option> ― When specified, Shorewall will not
generate tc or Netfilter rules to classify traffic based on packet
marks. You must do all classification using CLASSIFY rules in <ulink
url="shorewall-mangle.html">shorewall-mangle</ulink>(5).</para>
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<para><emphasis role="bold">connmark</emphasis> -- Added in
Shorewall 5.2.7. May only be specified if the REDIRECTED_INTERFACES
column is non-empty. It allows packet marks to be used to classify
traffic for these interfaces.</para>
<para><option>htb</option> - Use the <firstterm>Hierarchical Token
Bucket</firstterm> queuing discipline. This is the default.</para>
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<para><option>hfsc</option> - Shorewall normally uses the
Hierarchical Token Bucket queuing discipline. When
<option>hfsc</option> is specified, the <firstterm>Hierarchical Fair
Service Curves</firstterm> discipline is used instead (see tc-hfsc
(7)).</para>
<para><emphasis role="bold">linklayer</emphasis> - Added in
Shorewall 4.5.6. Type of link (ethernet, atm, adsl). When specified,
causes scheduler packet size manipulation as described in tc-stab
(8). When this option is given, the following options may also be
given after it:</para>
<blockquote>
<para><emphasis
role="bold">mtu</emphasis>=<replaceable>mtu</replaceable> - The
device MTU; default 2048 (will be rounded up to a power of
two)</para>
<para><emphasis
role="bold">mpu</emphasis>=<replaceable>mpubytes</replaceable> -
Minimum packet size used in calculations. Smaller packets will be
rounded up to this size</para>
<para><emphasis
role="bold">tsize</emphasis>=<replaceable>tablesize</replaceable>
- Size table entries; default is 512</para>
<para><emphasis
role="bold">overhead</emphasis>=<replaceable>overheadbytes</replaceable>
- Number of overhead bytes per packet.</para>
</blockquote>
</listitem>
</varlistentry>
<varlistentry>
<term><emphasis role="bold">REDIRECTED INTERFACES</emphasis>
(redirect)-
[<emphasis>interface</emphasis>[,<emphasis>interface</emphasis>]...]</term>
<listitem>
<para>May only be specified if the interface in the INTERFACE column
is an Intermediate Frame Block (IFB) device. Causes packets that
enter each listed interface to be passed through the egress filters
defined for this device, thus providing a form of incoming traffic
shaping. When this column is non-empty, the <emphasis
role="bold">classify</emphasis> option is assumed unless the
<emphasis role="bold">connmark</emphasis> option is
specified.</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1>
<title>Examples</title>
<variablelist>
<varlistentry>
<term>Example 1:</term>
<listitem>
<para>Suppose you are using PPP over Ethernet (DSL) and ppp0 is the
interface for this. The device has an outgoing bandwidth of 500kbit
and an incoming bandwidth of 6000kbit</para>
<programlisting> #INTERFACE IN-BANDWIDTH OUT-BANDWIDTH OPTIONS REDIRECTED
# INTERFACES
1:ppp0 6000kbit 500kbit</programlisting>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1>
<title>FILES</title>
<para>/etc/shorewall/tcdevices</para>
<para>/etc/shorewall6/tcdevices</para>
</refsect1>
<refsect1>
<title>See ALSO</title>
<para>tc-hfsc (7)</para>
<para><ulink
url="../traffic_shaping.htm">https://shorewall.org/traffic_shaping.htm</ulink></para>
<para><ulink
url="../configuration_file_basics.htm#Pairs">https://shorewall.org/configuration_file_basics.htm#Pairs</ulink></para>
<para><ulink
url="http://ace-host.stuart.id.au/russell/files/tc/doc/estimators.txt">http://ace-host.stuart.id.au/russell/files/tc/doc/estimators.txt</ulink></para>
<para>shorewall(8)</para>
</refsect1>
</refentry>