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[master] clarify message-compression doc

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- mention TCP and RFC compliance issues
This commit is contained in:
Evan Hunt 2015-11-06 13:44:28 -08:00
parent b513918481
commit 17834caa6c
1 changed files with 9 additions and 6 deletions
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15
doc/arm/Bv9ARM-book.xml
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@ -6154,12 +6154,15 @@ options {
<varlistentry>
<term><command>message-compression</command></term> <listitem>
<para>
If <userinput>yes</userinput>, DNS name compression will
be used for responses to regular queries (not including
If <userinput>yes</userinput>, DNS name compression is
used in responses to regular queries (not including
AXFR or IXFR, which always uses compression). Setting
this option to <userinput>no</userinput> can result in
larger responses, but will reduce CPU usage on servers.
The default is <userinput>yes</userinput>.
this option to <userinput>no</userinput> reduces CPU
usage on servers and may improve throughput. However,
it increases response size, which may cause more queries
to be processed using TCP; a server with compression
disabled is out of compiance with RFC 1123 Section
6.1.3.2. The default is <userinput>yes</userinput>.
</para>
</listitem>
</varlistentry>
@ -6699,7 +6702,7 @@ options {
<varlistentry>
<term><command>auto-dnssec</command></term>
<listitem>
<para>
<para>
Zones configured for dynamic DNS may use this
option to allow varying levels of automatic DNSSEC key
management. There are three possible settings: