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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 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…

3 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…

4 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…

5 Using the Response Rate Limiting Feature in BIND 9.9 ESV

RRL, or Response Rate Limiting, is an enhancement to the DNS protocol which serves as a mitigation tool for the problem of DNS amplification attacks. At this time, RRL implementation is only recommended for authoritative servers. DNS reply packets are usually…

6 A Quick Introduction to Response Rate Limiting

What is RRL? RRL, or Response Rate Limiting, is an enhancement to implementations of the DNS protocol that can help mitigate DNS amplification attacks (see KB article AA-00897). In such an attack, the attacker sends high volumes of forged DNS queries to a…

7 Using the Response Rate Limiting Feature in BIND 9.10

RRL, or Response Rate Limiting, is an enhancement to the DNS protocol which serves as a mitigation tool for the problem of DNS amplification attacks. At this time, RRL implementation is only recommended for authoritative servers. This article explains how…