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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 DNS Cookies in BIND 9.10 and 9.11

DNS COOKIE is an Extended DNS (EDNS) option which, when both the client and server support it, allows the client to detect and ignore off-path spoofed responses, and the server to determine that a client's address is not spoofed. It is supported as an experimental…

5 Testing authoritative server support for EDNS and large UDP buffer sizes in BIND 9.10

The EDNS fallback code was re-worked in BIND 9.10 to make it more resilient and reliable when: Encountering new authoritative servers that have not been queried before and for whom the capabilities/support for EDNS and large buffer sizes by both the server…

6 IPv6 Changes in BIND 9.11.0, BIND 9.10.4 and BIND 9.9.9.

BIND 9.11.0, BIND 9.10.4 and BIND 9.9.9 introduces two IPv6 related changes. The first change is to the preferred-glue option. Preferred-glue now defaults to the transport that the query was received over. If named receives a query over IPv6 and there is…

7 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…

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 NXDOMAIN Redirection Using DLZ in BIND 9.10

NXDOMAIN redirection is a BIND feature providing the ability for a recursive server to replace an NXDOMAIN response to a query with a configured answer of its own. This substitute response is returned to the original client in place of the NXDOMAIN response…

10 Using the GeoIP Features in BIND 9.10

BIND 9 access control lists are used to limit access to various server functions according to the IP address of the requestor of that access. BIND 9.10 is able to use data from MaxMind GeoIP databases to achieve restrictions based on the (presumed) geographic…

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