DNS ROOT understanding

[phn at icke-reklam.ipsec.nu]

Nicolas LIENARD <nlienard at fr.colt.net> wrote:
> Hi all,

> I 'd like to know how do "Named"  query a root server (by the root.db l=
ist=20
> with the 13 root servers) when it s looking for an authoritative NS abo=
ut a=20
> zone.

> For instance, if the DNS CACHE server lost 7 root servers because of a=20
> backbone issue; how will be the behaviour of named about the 7 root ser=
vers=20
> down and the 6 root servers UP ?.
Very well, thank you :-)


> Is it a round robin ?
Yes, a modified with weights given to each of them based on RTT. In essen=
ce
it will ask 13, but zooming into the "closest" but still now and then
send occational queries to the othes, in case something changed.

I think you with rndc dumpdb will se this :
; D.ROOT-SERVERS.NET [v4 TTL 81357] [v4 success] [v6 unexpected]
;       128.8.10.90 [srtt 23212] [flags 00000000]
; D.ROOT-SERVERS.NET [v4 TTL 80646] [v4 success] [v6 unexpected]
;       128.8.10.90 [srtt 23212] [flags 00000000]


( taken with bind-9.3.0 )

> Thanks in advance,

> Nicolas Li=E9nard=20



--=20
Peter H=E5kanson        =20
        IPSec  Sverige      ( At Gothenburg Riverside )
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,
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