Question about recursion queries

[Zhang Meng]

Thanks for your information.

But what does unknown servers mean? Where does the list come from?



On Tue, Jul 20, 2010 at 7:08 AM, Chris Buxton <chris.p.buxton at gmail.com>wrote:

> 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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>
>
>


-- 
Yours sincerely
ZhangMeng
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