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aca78add
Commit
aca78add
authored
Sep 05, 2019
by
Mark Andrews
Browse files
remove discussion about falling back to plain DNS on timeout
parent
160236a7
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#20911
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doc/arm/Bv9ARM-book.xml
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aca78add
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@@ -8963,18 +8963,7 @@ avoid-v6-udp-ports { 40000; range 50000 60000; };
this has the greatest chance of success on the first try.
</para>
<para>
If the initial response times out, <command>named</command>
will try again with plain DNS, and if that is successful,
it will be taken as evidence that the server does not
support EDNS. After enough failures using EDNS and
successes using plain DNS, <command>named</command>
will default to plain DNS for future communications
with that server. (Periodically, <command>named</command>
will send an EDNS query to see if the situation has
improved.)
</para>
<para>
However, if the initial query is successful with
If the initial query is successful with
EDNS advertising a buffer size of 512, then
<command>named</command> will advertise progressively
larger buffer sizes on successive queries, until
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Mark Andrews
@marka
mentioned in commit
91b0e48b
·
Sep 06, 2019
mentioned in commit
91b0e48b
mentioned in commit 91b0e48b2af0a01f5d13dfff2a4db6647cf17b3c
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Matthijs Mekking
🏡
@matthijs
mentioned in issue
#2127 (closed)
·
Sep 10, 2020
mentioned in issue
#2127 (closed)
mentioned in issue #2127
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