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Update simple TC doc

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Tom Eastep 2010-09-14 07:59:01 -07:00
parent c6960f1ac2
commit 2ff06f5f0a
1 changed files with 21 additions and 8 deletions
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docs/simple_traffic_shaping.xml
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@ -62,7 +62,7 @@
<para>Assuming that your external interface is eth0:</para> <para>Assuming that your external interface is eth0:</para>
<programlisting>#INTERFACE TYPE IN-BANDWIDTH <programlisting>#INTERFACE TYPE IN-BANDWIDTH OUT-BANDWIDTH
eth0 External</programlisting> eth0 External</programlisting>
<note> <note>
@ -214,13 +214,13 @@ eth0 External</programlisting>
is NO space between the number and the unit (it is 100kbit not 100 kbit). is NO space between the number and the unit (it is 100kbit not 100 kbit).
<emphasis role="bold">mbit</emphasis>, <emphasis <emphasis role="bold">mbit</emphasis>, <emphasis
role="bold">mbps</emphasis> or a raw number (which means bytes) can be role="bold">mbps</emphasis> or a raw number (which means bytes) can be
used, but note that only integer numbers are supported (0.5 is not valid). used, but note that before Shorewall 4.4.13 only integer numbers were
To pick an appropriate setting, we recommend that you start by setting supported (0.5 was not valid). To pick an appropriate setting, we
IN-BANDWIDTH significantly below your measured download bandwidth (20% or recommend that you start by setting IN-BANDWIDTH significantly below your
so). While downloading, measure the ping response time from the firewall measured download bandwidth (20% or so). While downloading, measure the
to the upstream router as you gradually increase the setting. The optimal ping response time from the firewall to the upstream router as you
setting is at the point beyond which the ping time increases sharply as gradually increase the setting. The optimal setting is at the point beyond
you increase the setting.</para> which the ping time increases sharply as you increase the setting.</para>
<para>Simple Traffic Shaping is only appropriate on interfaces where <para>Simple Traffic Shaping is only appropriate on interfaces where
output queuing occurs. As a consequence, you usually only use it on output queuing occurs. As a consequence, you usually only use it on
@ -231,6 +231,19 @@ eth0 External</programlisting>
<programlisting>#INTERFACE TYPE IN-BANDWIDTH <programlisting>#INTERFACE TYPE IN-BANDWIDTH
tun0 Internal</programlisting> tun0 Internal</programlisting>
<para>For fast lines, the actual download rate may be significantly less
than the specified IN-BANDWIDTH. Beginning with Shoreall 4.4.13, you can
specify an optional burst </para>
<para>Also beginning with Shorewall 4.4.13, an OUT-BANDWIDTH column is
available in <ulink
url="manpages/shorewall-tcpri.html">shorewall-tcpri</ulink>(5). Limiting
to outgoing bandwidth can have a positive effect on latency for
applications like VOIP. We recommend that you begin with a setting that is
at least 20% less than your measured upload rate and then gradually
increase it until latency becomes unacceptable. Then reduce it back to the
point where latency is acceptable.</para>
</section> </section>
<section> <section>