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Explain RATE and BURST in the basics doc

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Signed-off-by: Tom Eastep <teastep@shorewall.net>
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Tom Eastep 2010-02-14 08:53:58 -08:00
parent da4b2049c7
commit 53902b058e
1 changed files with 29 additions and 3 deletions
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32
docs/configuration_file_basics.xml
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@ -1140,9 +1140,9 @@ DNAT net loc:192.168.1.3 tcp 4000:4100</programlisting>
'!' to specify "All ports except these" (e.g., "!80,443").</para>
<para>Prior to Shorewall 4.4.4, port lists appearing in the <ulink
url="manpages/shorewall-routestopped.html">/etc/shorewall/routestopped</ulink>
file may specify no more than 15 ports; port ranges appearing in a list
count as two ports each.</para>
url="manpages/shorewall-routestopped.html">shorewall-routestopped</ulink>
(5) file may specify no more than 15 ports; port ranges appearing in a
list count as two ports each.</para>
</section>
<section id="MAC">
@ -1186,6 +1186,32 @@ DNAT net loc:192.168.1.3 tcp 4000:4100</programlisting>
</note>
</section>
<section id="RateLimit">
<title>Rate Limiting (Rate and Burst)</title>
<para>Shorewall supports rate limiting in a number of ways. When
specifying a rate limit, both a <firstterm>rate</firstterm> and a
<firstterm>burst</firstterm> value are given.</para>
<para>Example from <ulink
url="manpages/shorewall.conf.html">shorewall.conf</ulink> (5): </para>
<simplelist>
<member>LOGRATE=10/minute</member>
<member>LOGBURST=5</member>
</simplelist>
<para> For each logging rule, the first time the rule is reached, the
packet will be logged; in fact, since the burst is 5, the first five
packets will be logged. After this, it will be 6 seconds (1 minute divided
by the rate of 10) before a message will be logged from the rule,
regardless of how many packets reach it. Also, every 6 seconds which
passes without matching a packet, one of the bursts will be regained; if
no packets hit the rule for 30 seconds, the burst will be fully recharged;
back where we started.</para>
</section>
<section id="Logical">
<title>Logical Interface Names</title>