[CentOS] inconsistent DNS results - ping vs dig vs nslookup

[Giles Coochey]

Can you avoid the bar.baz.domain.com.domain.com by searching for

bar.baz.domain.com.

(note trailing dot)

??


On Thu, June 23, 2011 11:06, John Hodrien wrote:
> On Wed, 22 Jun 2011, Ljubomir Ljubojevic wrote:
>
>> As Les wrote in another branch of the thread, search clause is if you
>> try name without a domain.
>
> I think it's slightly more subtle and possibly more annoying than that.
>
> Say you have a machine called foo.mydomain.com
>
> By default (if you don't specify it), search is set to be mydomain.com.
>
> So a lookup for bar would initially be done as bar.domain.com.
>
> A lookup for bar.baz would initially be searched for as bar.baz (because
> it
> has at least ndots in it), but if that failed, would then be looked up as
> bar.baz.domain.com.
>
> Equally a search for baz.domain.com (where baz didn't exist) would be
> looked
> up first as baz.domain.com and then as baz.domain.com.domain.com.
>
> This appears to be doubly annoying with programs compile with IPv6 support
> where there aren't AAAA records.
>
> So a typical valid lookup for machine.domain.com becomes:
>
> AAAA lookup for machine.domain.com (not found)
> AAAA lookup for machine.domain.com.domain.com (not found)
> A lookup for machine.domain.com (found)
>
> jh
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