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