[clue-tech] DNS

[Will]

A Linux box will wait 5 seconds and then move on to the next server.

http://linux.die.net/man/5/resolver
"timeout:*n*
sets the amount of time the resolver will wait for a response from a remote
name server before retrying the query via a different name server. Measured
in seconds, the default is RES_TIMEOUT (see
*<resolv.h<http://linux.die.net/include/resolv.h>>
)."*
<http://linux.die.net/man/5/resolver>http://linux.die.net/include/resolv.h
<http://linux.die.net/include/resolv.h>"# define RES_TIMEOUT 5 /* min.
seconds between retries */"

On Thu, Nov 18, 2010 at 2:49 PM, Will <will.sterling at gmail.com> wrote:

> Microsoft Technet says that a Windows DNS server will wait three seconds
> for a DNS server to respond during a recursive lookup before moving on to
> the next server for the domain.  I suspect BIND is similar but I do not see
> mention of it in the documentation.
>
> On the client side a Windows machine will give it's preferred DNS server
> two seconds to respond before moving on to the next DNS server in its list.
>  Again I could not find anything on the BIND light weight resolver.
>
>
> On Thu, Nov 18, 2010 at 1:26 PM, Roy <rjohnston at denverinternet.com> wrote:
>
>> dns will round robin through the servers- so on a no response it may retry
>> but if it does get a response but bad data - it will cache that and stop.
>> which is why all authoritative NS need to be up to date and synced.
>>
>>
>>
>> Chris Ernst <penguin-guy at comcast.net> wrote:
>>
>> >It's up to the client.  Typically, if the initial request fails and
>> >there is another NS record, it will just try the next one.
>> >
>> >       - Chris
>> >
>> >On 11/18/2010 12:56 PM, David L. Willson wrote:
>> >> If a domain has a couple NS records setup at the registrar, what
>> happens
>> >> if one of name-servers is down? Do lookups fail back to the client or
>> >> fail gracefully to the other NS with no notice to the client?
>> >>
>> >> What if there are more than two name-servers? Are they all tried before
>> >> a failure is reported, or just a certain number?
>> >>
>> >> What if the name-server is up, but there's another sort of failure,
>> like
>> >> "no such domain" or something like that?
>> >>
>> >> I am willing and able to look this up myself, or trace it out myself,
>> >> but I'm short of time, so I thought I'd check if someone knew off the
>> >> top of their head, and wanted to show off a bit.
>> >>
>> >> David L. Willson
>> >> Trainer, Engineer, Enthusiast
>> >> MCT MCSE Network+ A+ Linux+ LPIC-1 NovellCLA UbuntuCP
>> >> tel://720.333.LANS
>> >> Freeing the world from the tyranny (or whatevery) of Microsofty-ness
>> >>
>> >>
>> >>
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>
>
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