Re: Needless DNS queries

From	Lee <ler762@gmail.com>
Newsgroups	linux.debian.user
Subject	Re: Needless DNS queries
Date	2022-06-08 00:10 +0200
Message-ID	<EvPyF-3i4G-9@gated-at.bofh.it> (permalink)
References	<EvJ0d-3dZZ-11@gated-at.bofh.it> <EvJtf-3e9Z-7@gated-at.bofh.it> <EvKIG-3eUD-5@gated-at.bofh.it> <EvLln-3fmu-3@gated-at.bofh.it>
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On 6/7/22, Darac Marjal <mailinglist@darac.org.uk> wrote:
>
> On 07/06/2022 17:53, Greg Wooledge wrote:
>>
>> To the best of my knowledge, there isn't any setting to *prevent* the
>> appending of search domains to a name, no matter how many dots you put
>> in the name.
>
> I've wondered about that in the past. Is this maybe a bug in the
> application, then (I admit that it'll be a widespread bug if so).

I'd go for a bug in the documentation.
Names ending with a dot don't get the search list appended to the name
on a lookup failure.

Think about it.. the trailing dot is the root of the DNS tree.  I
wouldn't make sense to add anything after that.

> To my
> knowledge, DNS domains support "relative" names (e.g. "www.example.com")
> as well as "absolute" names (e.g. "www.example.com." - with the trailing
> dot). Should applications be querying for hostnames with the trailing
> dot and, if so, would that prevent the resolver from trying to append
> the search domains?

You can always put the trailing dot in there yourself - eg
  ping foo.home.
if you don't want the search list appended on a lookup failure.

Lee

Thread

Needless DNS queries Dieter Rohlfing <dr-erc@gmx.net> - 2022-06-07 17:10 +0200
  Re: Needless DNS queries David Wright <deblis@lionunicorn.co.uk> - 2022-06-07 17:30 +0200
  Re: Needless DNS queries Dan Ritter <dsr@randomstring.org> - 2022-06-07 17:40 +0200
    Re: Needless DNS queries Tim Woodall <debianuser@woodall.me.uk> - 2022-06-07 18:10 +0200
    Re: Needless DNS queries Greg Wooledge <greg@wooledge.org> - 2022-06-07 19:00 +0200
      Re: Needless DNS queries Darac Marjal <mailinglist@darac.org.uk> - 2022-06-07 19:40 +0200
        Re: Needless DNS queries Lee <ler762@gmail.com> - 2022-06-08 00:10 +0200
      Re: Needless DNS queries Tim Woodall <debianuser@woodall.me.uk> - 2022-06-08 00:20 +0200
        Re: Needless DNS queries Lee <ler762@gmail.com> - 2022-06-08 03:00 +0200
          Re: Needless DNS queries Greg Wooledge <greg@wooledge.org> - 2022-06-08 03:10 +0200
            Re: Needless DNS queries Lee <ler762@gmail.com> - 2022-06-08 07:30 +0200
  Re: Needless DNS queries Dieter Rohlfing <dr-erc@gmx.net> - 2022-06-14 15:10 +0200

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