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Created Oct 24, 2019 by Vicky Risk@vickyDeveloper

Req 7.2 - Throttling

I would like to know if I am throttling traffic based on configured limits. If so, I might want to change these limits to throttle more or less.

These limits are typically designed to protect the system from being overwhelmed in case of a DDOS. However, sometimes the throttles are set low enough that they impact throughput unnecessarily during normal operation.

Priorities

  • Fetch-limits
  • clients per query
  • client-quotas
  • TCP quotas
  • RRL

? Is this server being throttled by fetch-limits or is this zone being throttled by fetch-limits? Log instances of crossing the thresholds where throttling kicks in, when you cross the threshold again on the way down.

Several specific problems we would like to address are:

  • bind9#665 Add "rndc fetchlimits" command to dump currently-active ADB rate-limited servers and zones
  • bind9#915 Add ability to determine frozen zones
  • bind9#1232 (closed) [ISC-support #15166] expose zone timers (reload, refresh, expire) via stats channel
Edited Apr 22, 2020 by Vicky Risk
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