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2020-12-15 13:24:56 +00:00
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@@ -4,7 +4,7 @@ description = "*forward* facilitates proxying DNS messages to upstream resolvers
weight = 20
tags = ["plugin", "forward"]
categories = ["plugin"]
date = "2020-11-03T14:42:34.87734811"
date = "2020-12-15T13:24:56.87756812"
+++
## Description
@@ -91,7 +91,7 @@ forward FROM TO... {
* `no_rec` - optional argument that sets the RecursionDesired-flag of the dns-query used in health checking to `false`.
The flag is default `true`.
* `max_concurrent` **MAX** will limit the number of concurrent queries to **MAX**. Any new query that would
raise the number of concurrent queries above the **MAX** will result in a SERVFAIL response. This
raise the number of concurrent queries above the **MAX** will result in a REFUSED response. This
response does not count as a health failure. When choosing a value for **MAX**, pick a number
at least greater than the expected *upstream query rate* * *latency* of the upstream servers.
As an upper bound for **MAX**, consider that each concurrent query will use about 2kb of memory.