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Support Central: KB #5039: ‘set holddown’ command blocking all recursive queries
Support Central: KB #5039: ‘set holddown’ command blocking all recursive queries
EricS
05-07-2016
11:25 AM
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Problem Summary
The 'set holddown' command blocking all recursive queries
Customer Environment
Infoblox Grid running DNS service with global forwarders and 'set holddown' and forward-only clause enabled
Versions
All versions of NIOS
Cause
The 'set holddown' command cannot distinguish between a server or a forwarder and for this reason, all configurations are treated the same. Hence, all recursive queries may get 'held down'
Resolution
Disable the 'set holddown' command and instead use 'fetches-per-server' and 'fetches-per-zone' commands.
The holddown feature (stop query to server with too many timeouts) does not take forwarders into account. It should not be enabled on a server using forward only. The fetches-per-server feature (limit queries in-flight to any given server) does take forwarders into account. However, if you have a global forwarder then it makes no sense at all to enable the feature.
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