On 1 November 2012 11:32, bert hubert <bert.hub...@netherlabs.nl> wrote:
> On Thu, Nov 01, 2012 at 11:28:20AM +0000, James Leavers wrote: > > Hi, > > > > Is it correct that the recursor will use the results from the root > servers > > as opposed to the next level down, the gTLD servers? For instance: dig ns > > yahooapis.com on my PowerDNS recursor: > > Yes, for NS records and currently released PowerDNS versions, this is true. > It is a slight wart. > > > The root servers have ns7 whereas the gtld servers do not. So it's almost > > as if my pDNS implementation (pdns-recursor-3.1.5-1.el5.centos) is using > > the root server results as opposed to the gtld results. Is this what's > > happening? > > Once a single query has gone on to the servers with all the data, that data > then prevails (after the packetcache has expired which contained the first > answer based on the COM server answer). > > -- > PowerDNS Website: http://www.powerdns.com/ > PowerDNS Community Website: http://wiki.powerdns.com/ > PowerDNS is supported and developed by Netherlabs: > http://www.netherlabs.nl Thanks - as a test I have just installed the latest version pdns-recursor-3.3-1 on a separate server and copied recursor.conf across from the original server to make it the fairest test I could think of - interestingly this does not appear to have the same issue. ; <<>> DiG 9.3.6-P1-RedHat-9.3.6-4.P1.el5_5.3 <<>> @localhost ns yahooapis.com ; (1 server found) ;; global options: printcmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 7930 ;; flags: qr rd ra; QUERY: 1, ANSWER: 4, AUTHORITY: 0, ADDITIONAL: 4 ;; QUESTION SECTION: ;yahooapis.com. IN NS ;; ANSWER SECTION: yahooapis.com. 86400 IN NS ns1.yahoo.com. yahooapis.com. 86400 IN NS ns2.yahoo.com. yahooapis.com. 86400 IN NS ns3.yahoo.com. yahooapis.com. 86400 IN NS ns5.yahoo.com.
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