From aca78add3a686f7df1053efc3cba3b7df44b7342 Mon Sep 17 00:00:00 2001 From: Mark Andrews Date: Thu, 5 Sep 2019 10:18:36 +1000 Subject: [PATCH] remove discussion about falling back to plain DNS on timeout --- doc/arm/Bv9ARM-book.xml | 13 +------------ 1 file changed, 1 insertion(+), 12 deletions(-) diff --git a/doc/arm/Bv9ARM-book.xml b/doc/arm/Bv9ARM-book.xml index 86d4ccd187..f1722e104c 100644 --- a/doc/arm/Bv9ARM-book.xml +++ b/doc/arm/Bv9ARM-book.xml @@ -8963,18 +8963,7 @@ avoid-v6-udp-ports { 40000; range 50000 60000; }; this has the greatest chance of success on the first try. - If the initial response times out, named - 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, named - will default to plain DNS for future communications - with that server. (Periodically, named - will send an EDNS query to see if the situation has - improved.) - - - However, if the initial query is successful with + If the initial query is successful with EDNS advertising a buffer size of 512, then named will advertise progressively larger buffer sizes on successive queries, until