[Pdns-users] rec_control wipe-cache not clear packet cache

Jeremy Utley pdns at gammanetworking.com
Mon Jul 18 15:15:35 UTC 2011

Good morning to all on the list!

We ran into an oddity with our recursors this morning that I wanted to 
consult with you about.  There was a domain we knew had it's DNS entries 
changed, but our recursors were still getting the old data, and we 
wanted to fix that.  So, as I always do in this situation, I ran the 

rec_control wipe-cache www.domain.com

as I always do in those situations.  However, for some odd reason, this 
time it did not seem to purge the entry from the cache, because a 
subsequent dig query to the recursor still showed the old entry, with 
the TTL value counting down.  Only by doing a full restart of the 
recursor did we actually get the cache to clear.

This was on PowerDNS Recursor version 3.3, using the pdns-recursor-3.3-1 
rpms available from the PDNS site.

Question:  Is it possible that wipe-cache perhaps does not clear the 
packet cache or any other form of entry caching in the recursors?


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