[Pdns-users] Strange Priming behavior?

Peter van Dijk peter.van.dijk at netherlabs.nl
Fri Dec 19 14:05:18 UTC 2014

Hello Runxia,

On 18 Dec 2014, at 10:53 , RunxiaWan <wanrunxia at aliyun.com> wrote:

> I am trying to test powerDNS’s behavior and find something strange. When I use hint-file configuration to set a hint-file, powerDNS-recursor will just use the ip address in hint file without doing a NS query to root server. I wonder if it is a implement difference( cause I know bind and unbound would do a NS query) or I wipe the cache in a wrong way(I use ”rec_control wipe-cache .” to wipe the cache).

Dec 19 14:04:09 Done priming cache with root hints

14:04:10.074423 IP (tos 0x0, ttl 64, id 16861, offset 0, flags [DF], proto UDP (17), length 45) > [bad udp cksum 0x3834 -> 0x967e!] 16095 NS? . (17)
14:04:10.086680 IP (tos 0x0, ttl 61, id 58479, offset 0, flags [none], proto UDP (17), length 520) > [udp sum ok] 16095*- q: NS? . 13/0/15 [answer omitted]

Dec 19 14:04:10 Refreshed . records

In other words, I see an NS query to one root server (a different one for each of 3 attempts).

Can you clarify your question and/or show us what you are seeing?

Kind regards,
Peter van Dijk
Netherlabs Computer Consulting BV - http://www.netherlabs.nl/

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