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1 Recursive Client Rate limiting - FAQs Featured

Recursive Client Rate limiting provides new tuning controls intended to optimize recursive server behavior in favor of good client queries, whilst at the same time limiting the impact of bad client queries (e.g. queries which cannot be resolved, or which…

2 prefetch performance in BIND 9.10 Featured

Our new feature Early refresh of cache records (cache prefetch) in BIND 9.1 unfortunately came with a design defect that was not spotted until recently, and which can cause performance degradation in some situations. If you are experiencing surprising and…

3 --with-tuning=large - about using this build-time option Featured

In BIND 9.10 (and earlier in the stable preview edition) we added a built-time option --with-tuning=large. This option allows operators to tune BIND for better performance in high-memory machines, by setting various constants and defaults to values more appropriate…

4 serial-query-rate, notify-rate and startup-notify-rate: how they impact zone transfers in different versions of BIND

serial-query-rate (default 20) is a rate-limiter, that has been used to for a long time to control both the rate of notifies and of zone refresh (SOA queries). Although the limit is expressed as a per-second rate, it is the actions that are being limited,…

5 BIND9 Significant Features Matrix

The "S" (stable preview) editions and the other release branches of BIND differ in a number of ways. This table lists the major feature differences for current main supported versions of BIND, (with some provisional but incomplete insight into our future…

6 Recursive Client Rate limiting in BIND 9.9.8 and 9.10.3

Several new tuning options for recursive server behavior had been undergoing testing in production environments by ISC customers who have been using special feature preview builds of BIND. These features are intended to optimize recursive server behavior…

7 Recursive Client Rate limiting in BIND 9.9 Subscription Version and BIND 9.9 and 9.10 Experimental versions

This article applies to BIND 9.9.6 and 9.9.7 subscription version and to the BIND 9.9 and 9.10 experimental versions only With the release of BIND 9.9.8 and 9.10.3, we are updating the Recursive Client Rate limiting functionality and encourage those using…

8 Eleven, twelve; dig and delv: BIND 9.10

Delv Surely you remember the old nursery rhyme that begins with "One, two, buckle my shoe". You might have forgotten that its sixth verse is "Eleven, twelve, dig and delve". How many nursery rhymes have their own Wikipedia page? BIND 9.10 contains a new debugging…

9 Operating statistics provided by BIND 9.10 statistics channels

BIND listens for queries on Port 53. It listens for communication from RNDC on port 953. And it can be configured to listen for statistics requests on another port, typically port 80. To configure BIND so that it will offer statistics to clients that connect…

10 Early refresh of cache records (cache prefetch) in BIND 9.10

A DNS resolver (recursive server) looks up information for its clients. When it finds an answer, it keeps a copy cached locally in addition to returning the answer to the requesting client. This ensures that if another request for the same information arrives,…

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