Question about recursion queries
Chris Buxton
chris.p.buxton at gmail.com
Mon Jul 19 23:08:22 UTC 2010
It uses the RTT algorithm to select the "fastest" server from the list, using random, low values for unknown servers. ("Fastest" is in quotes because the algorithm does not do exactly that, but it's close.)
No, I cannot show you the code. I'm not a developer. Find it yourself.
Regards,
Chris Buxton
BlueCat Networks
On Jul 19, 2010, at 2:12 AM, Zhang Meng wrote:
>
> The question is given that
>
> When I ask the bind server, what's the A record of google.com?
>
> for the ROOT name server, there're several NS record
>
> . 60493 IN NS g.root-servers.net.
> . 60493 IN NS b.root-servers.net.
> . 60493 IN NS m.root-servers.net.
> . 60493 IN NS d.root-servers.net.
> . 60493 IN NS j.root-servers.net.
> . 60493 IN NS c.root-servers.net.
> . 60493 IN NS i.root-servers.net.
> . 60493 IN NS a.root-servers.net.
> . 60493 IN NS h.root-servers.net.
> . 60493 IN NS k.root-servers.net.
> . 60493 IN NS l.root-servers.net.
> . 60493 IN NS f.root-servers.net.
> . 60493 IN NS e.root-servers.net.
>
> How does the bind handle these multiple NS records?
>
> A).Select one of them to ask the NS records for com. ? If fails, try the second one?
> B).Or send several queries concurrently, and get the first one responsed?
>
>
> Could you show me the related code in Bind9.7.1-P2?
>
> --
> Yours sincerely
> ZhangMeng
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