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Merge branch '1212-edns-udp-size-docs-not-updated-for-flag-day-changes' into 'master'

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Resolve "edns-udp-size docs not updated for Flag Day changes"

Closes #1212

See merge request isc-projects/bind9!2312
This commit is contained in:
Mark Andrews
2019-09-05 19:35:09 -04:00
parent 160236a780 aca78add3a
commit 2e18e83131
1 changed files with 1 additions and 12 deletions
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13
doc/arm/Bv9ARM-book.xml
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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. this has the greatest chance of success on the first try.
</para> </para>
<para> <para>
If the initial response times out, <command>named</command> If the initial query is successful with
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
EDNS advertising a buffer size of 512, then EDNS advertising a buffer size of 512, then
<command>named</command> will advertise progressively <command>named</command> will advertise progressively
larger buffer sizes on successive queries, until larger buffer sizes on successive queries, until