Groups > comp.os.linux.networking > #1505

Re: "Timeout" DNS IP to name resolution

From	buck <buck@private.mil>
Newsgroups	comp.os.linux.networking
Subject	Re: "Timeout" DNS IP to name resolution
Date	2012-06-30 20:04 +0000
Organization	Say What?
Message-ID	<jsnm4p01jqn@news4.newsguy.com> (permalink)
References	<js5006016b1@news1.newsguy.com> <a4vrv9F21bU2@mid.individual.net> <jskmvk02k52@news7.newsguy.com> <jsl0hn$q89$1@dont-email.me>

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Joe Beanfish <joebeanfish@nospam.duh> wrote in news:jsl0hn$q89$1@dont-
email.me:

> Not all IPs have names. Those will never resolve.
> Question is whether jdresolve resolves any fewer than apache?

Since Apache is now happy, I just reported my jdresolve "60% problem" 
for those who stumble across this thread.

Apache does a lot better than jdresolve at rDNS.  My upstream has 3 
servers, 2 of which I'll call "balky" because they sometimes work and 
sometimes/often fail.  Since I set up the system to use the one server 
that always works, the problem has been alleviated.  Now, only a few 
timeouts a day occur.

I think the problem with jdresolve is the Net::DNS Perl module it 
requires.  If it were to become necessary, I could get the jdresolve 
script worked on to become hierarchical, first trying a caching DNS on 
the LAN, then the upstream NS, and finally - as a "last resort" effort 
- the root servers.  But that isn't likely because the only benefits I 
find in jdresolve are that the IP can be anywhere in the logged line 
and that recursion can be turned on.  Neither of those things are 
presently necessary.
--
buck

Thread

"Timeout" DNS IP to name resolution buck <buck@private.mil> - 2012-06-23 17:56 +0000
  Re: "Timeout" DNS IP to name resolution Chris Davies <chris-usenet@roaima.co.uk> - 2012-06-23 22:29 +0100
    Re: "Timeout" DNS IP to name resolution buck <buck@private.mil> - 2012-06-24 01:05 +0000
      Re: "Timeout" DNS IP to name resolution Pascal Hambourg <boite-a-spam@plouf.fr.eu.org> - 2012-06-24 11:52 +0200
      Re: "Timeout" DNS IP to name resolution Chris Davies <chris-usenet@roaima.co.uk> - 2012-06-24 12:15 +0100
        Re: "Timeout" DNS IP to name resolution Moe Trin <ibuprofin@painkiller.example.tld.invalid> - 2012-06-24 11:09 -0500
          Re: "Timeout" DNS IP to name resolution buck <buck@private.mil> - 2012-06-24 19:50 +0000
            Re: "Timeout" DNS IP to name resolution Moe Trin <ibuprofin@painkiller.example.tld.invalid> - 2012-06-24 19:12 -0500
              Re: "Timeout" DNS IP to name resolution J G Miller <miller@yoyo.ORG> - 2012-06-25 10:22 +0000
  Re: "Timeout" DNS IP to name resolution MJ <me@invalid.org> - 2012-06-27 07:44 +0000
    Re: "Timeout" DNS IP to name resolution buck <buck@private.mil> - 2012-06-29 17:00 +0000
      Re: "Timeout" DNS IP to name resolution Joe Beanfish <joebeanfish@nospam.duh> - 2012-06-29 15:43 -0400
        Re: "Timeout" DNS IP to name resolution buck <buck@private.mil> - 2012-06-30 20:04 +0000
  Re: "Timeout" DNS IP to name resolution Martijn Lievaart <m@rtij.nl.invlalid> - 2012-06-30 00:58 +0200

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