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211 lines
8.0 KiB
HTML
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<meta http-equiv="Content-Type" content="text/html; charset=windows-1252">
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<meta name="GENERATOR" content="Microsoft FrontPage 5.0">
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<meta name="ProgId" content="FrontPage.Editor.Document">
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<title>Traffic Shaping</title>
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<table border="0" cellpadding="0" cellspacing="0" style="border-collapse: collapse" bordercolor="#111111" width="100%" id="AutoNumber1" bgcolor="#400169" height="90">
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<td width="100%">
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<h1 align="center"><font color="#FFFFFF">Traffic Shaping/Control</font></h1>
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</td>
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</tr>
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</table>
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<p align="left">Beginning with version 1.2.0, Shorewall has limited support for traffic
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shaping/control. In order to use traffic shaping under Shorewall, it is
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essential that you get a copy of the <a href="http://ds9a.nl/lartc">Linux Advanced Routing
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and Shaping HOWTO</a>, version 0.3.0 or later. You must also install
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the iproute (iproute2) package to provide the "ip" and "tc"
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utilities.</p>
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<p align="left">Shorewall traffic shaping support consists of the following:</p>
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<ul>
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<li>A new TC_ENABLED parameter in /etc/shorewall.conf. Traffic
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Shaping also requires that you enable packet mangling.<br>
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</li>
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<li>/etc/shorewall/tcrules - A file where you can specify
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firewall marking of packets. The firewall mark value may be used to classify
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packets for traffic shaping/control.<br>
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</li>
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<li>/etc/shorewall/tcstart - A user-supplied file that is
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sourced by Shorewall during "shorewall start" and which you can
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use to define your traffic shaping disciplines and classes. I have provided
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a <a href="ftp://ftp.shorewall.net/pub/shorewall/cbq">sample</a> that does
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table-driven CBQ shaping but if you read the traffic shaping sections of the
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HOWTO mentioned above, you can probably code your own faster than you can
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learn how to use my sample. I personally use <a href="http://luxik.cdi.cz/~devik/qos/htb/">HTB</a>
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(see below). HTB
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support may eventually become an integral part of Shorewall since HTB is a
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lot simpler and better-documented than CBQ. HTB is currently not a standard
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part of either the kernel or iproute2 so both must be patched in order to
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use it.<br>
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<br>
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In tcstart, when you want to run the 'tc' utility, use the run_tc function
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supplied by shorewall. <br>
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</li>
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<li>/etc/shorewall/tcclear - A user-supplied file that is
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sourced by Shorewall when it is clearing traffic shaping. This file is
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normally not required as Shorewall's method of clearing qdisc and filter
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definitions is pretty general.</li>
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</ul>
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<h3 align="left"><a name="tcrules"></a>/etc/shorewall/tcrules</h3>
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<p align="left">The fwmark classifier provides a convenient way to classify
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packets for traffic shaping. The /etc/shorewall/tcrules file provides a means
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for specifying these marks in a tabular fashion.</p>
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<p align="left">Columns in the file are as follows:</p>
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<ul>
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<li>MARK - Specifies the mark value is to be assigned in case of
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a match. This is an integer in the range 1-255.<br>
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<br>
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Example - 5<br>
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</li>
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<li>SOURCE - The source of the packet. If the packet originates
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on the firewall, place "fw" in this column. Otherwise, this is a
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comma-separated list of interface names, IP addresses, MAC addresses in
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<a href="Documentation.htm#MAC">Shorewall Format</a> and/or Subnets.<br>
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<br>
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Examples<br>
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eth0<br>
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192.168.2.4,192.168.1.0/24<br>
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</li>
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<li>DEST -- Destination of the packet. Comma-separated list of
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IP addresses and/or subnets.<br>
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</li>
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<li>PROTO - Protocol - Must be the name of a protocol from
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/etc/protocol, a number or "all"<br>
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</li>
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<li>PORT(S) - Destination Ports. A comma-separated list of Port
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names (from /etc/services), port numbers or port ranges (e.g., 21:22); if
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the protocol is "icmp", this column is interpreted as the
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destination icmp type(s).<br>
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</li>
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<li>CLIENT PORT(S) - (Optional) Port(s) used by the client. If
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omitted, any source port is acceptable. Specified as a comma-separate list
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of port names, port numbers or port ranges.</li>
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</ul>
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<p align="left">Example 1 - All packets arriving on eth1 should be marked with
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1. All packets arriving on eth2 should be marked with 2. All packets originating
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on the firewall itself should be marked with 3.</p>
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<table border="2" cellpadding="2" style="border-collapse: collapse">
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<tr>
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<td><b>MARK</b></td>
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<td><b>SOURCE</b></td>
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<td><b>DEST</b></td>
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<td><b>PROTO</b></td>
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<td><b>PORT(S)</b></td>
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<td><b>CLIENT PORT(S)</b></td>
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</tr>
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<tr>
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<td>1</td>
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<td>eth1</td>
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<td>0.0.0.0/0</td>
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<td>all</td>
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<td> </td>
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<td> </td>
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</tr>
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<tr>
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<td>2</td>
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<td>eth2</td>
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<td>0.0.0.0/0</td>
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<td>all</td>
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<td> </td>
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<td> </td>
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</tr>
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<tr>
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<td>3</td>
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<td>fw</td>
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<td>0.0.0.0/0</td>
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<td>all</td>
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<td> </td>
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<td> </td>
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</tr>
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</table>
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<p align="left">Example 2 - All GRE (protocol 47) packets not originating on the
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firewall and destined for 155.186.235.151 should be marked with 12.</p>
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<table border="2" cellpadding="2" style="border-collapse: collapse">
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<tr>
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<td><b>MARK</b></td>
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<td><b>SOURCE</b></td>
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<td><b>DEST</b></td>
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<td><b>PROTO</b></td>
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<td><b>PORT(S)</b></td>
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<td><b>CLIENT PORT(S)</b></td>
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</tr>
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<tr>
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<td>12</td>
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<td>0.0.0.0/0</td>
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<td>155.186.235.151</td>
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<td>47</td>
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<td> </td>
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<td> </td>
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</tr>
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</table>
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<p align="left">Example 3 - All SSH packets originating in 192.168.1.0/24 and
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destined for 155.186.235.151 should be marked with 22.</p>
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<table border="2" cellpadding="2" style="border-collapse: collapse">
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<tr>
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<td><b>MARK</b></td>
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<td><b>SOURCE</b></td>
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<td><b>DEST</b></td>
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<td><b>PROTO</b></td>
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<td><b>PORT(S)</b></td>
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<td><b>CLIENT PORT(S)</b></td>
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</tr>
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<tr>
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<td>22</td>
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<td>192.168.1.0/24</td>
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<td>155.186.235.151</td>
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<td>tcp</td>
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<td>22</td>
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<td> </td>
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</tr>
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</table>
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<h3>Hierarchical Token Bucket</h3>
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<p>I personally use HTB. I have found a couple of things that may be of
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use to others.</p>
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<ul>
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<li>The gzipped tc binary at the <a href="http://luxik.cdi.cz/~devik/qos/htb/">HTB
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website</a> didn't work for me -- I had to download the lastest version of
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the <a href="ftp://ftp.inr.ac.ru/ip-routing">iproute2 sources</a> and patch
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them for HTB.</li>
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<li>The HTB example in the HOWTO seems to be full of errors. I'm currently
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running with this set of shaping rules in my tcstart file so I know that it works.</li>
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</ul>
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<blockquote>
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<p><font face="Courier" size="2">run_tc qdisc add dev eth0 root handle 1: htb default 30<br>
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<br>
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run_tc class add dev eth0 parent 1: classid 1:1 htb rate 10mbit burst 15k<br>
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<br>
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run_tc class add dev eth0 parent 1:1 classid 1:10 htb rate 150kbit ceil 10mbit burst 15k<br>
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run_tc class add dev eth0 parent 1:1 classid 1:20 htb rate 234kbit ceil 10mbit burst 15k<br>
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run_tc class add dev eth0 parent 1:1 classid 1:30 htb rate 1kbit ceil
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10mbit burst 15k<br>
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<br>
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run_tc qdisc add dev eth0 parent 1:10 sfq perturb 10<br>
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run_tc qdisc add dev eth0 parent 1:20 sfq perturb 10<br>
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run_tc qdisc add dev eth0 parent 1:30 sfq perturb 10<br>
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<br>
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run_tc filter add dev eth0 protocol ip parent 1:0 prio 1 handle 1 fw classid 1:10<br>
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run_tc filter add dev eth0 protocol ip parent 1:0 prio 1 handle 2 fw classid 1:20<br>
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run_tc filter add dev eth0 protocol ip parent 1:0 prio 1 handle 3 fw classid 1:30
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</font></p>
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<p>My tcrules file is shown in Example 1 above. You can look at my <a href="myfiles.htm">network
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configuration</a> to get an idea of why I want these particular rules.<font face="Courier" size="2"><br>
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</font></p>
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</blockquote>
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<p><font size="2">Last Updated 6/18/2002 - <a href="support.htm">Tom
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Eastep</a></font></p>
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<p><font face="Trebuchet MS"><a href="copyright.htm"><font size="2">Copyright</font>
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<EFBFBD> <font size="2">2001, 2002 Thomas M. Eastep.</font></a></font></p>
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</body>
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</html> |