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Re: Strange DNS Lookup Problem

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<lybanon-8102FB.10124710022014@70-3-168-216.pools.spcsdns.net>,
 Matthew Lybanon <lybanon@earthlink.net> wrote:

> My wife's MacBook Pro has been running nicely for a year or more.  
> During setup it did whatever normally happens automatically to set up 
> internet access.  And everything worked just fine (at least from a 
> user's point of view).  But one day recently, Safari was unable to find 
> web pages (some, not all).  Restarting Safari and restarting the 
> computer didn't help.
> 
> Short version:  In the morning everything was fine, but in the evening, 
> upon waking the computer from sleep, Safari couldn't find most of the 
> web pages that had already been opened in tabs.  It could find a few, 
> but not many.
> 
> I looked at Network in System Preferences.  In Advanced.../DNS tab.  The 
> only entry under DNS Servers was 10.0.0.x (I forget exactly what x was).  
> 10.0.0.<something> describes all theIP addresses in our local network.  
> The lock showing in the network pane was locked (and neither my wife nor 
> our cats have the admin password).  Whatever was there (or had been 
> there) worked just fine for a long time, but suddenly it didn't.
> 
> I (as administrator) entered two IP addresses that at some time in the 
> dim past our internet provider had given me for DNS lookup, and that 
> fixed the problem.
> 
> But what happened?  Any ideas, folks?

For some reason (not enough information to say exactly what - I've got 
an idea or two, but they're not anything I can support with absolute 
certainty) her rig forgot who it was supposed to ask to do DNS lookups. 
The "10.0.0.x" address *SOUNDS LIKE* something may have gone wrong with 
a wireless connection, and the rig fell back to a default "I've got no 
network conneciton" setup that doesn't know anything about what DNS 
server should be used. SOMETIMES this works well enough due to locally 
cached DNS info, other times, not so much. Usually, when network access 
becomes possible again (for whatever reason...) the settings will revert 
to the ones that work. Other times, it may be necessary to manually put 
them back before everything is right with the world again.

-- 
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Thread

Strange DNS Lookup Problem Matthew Lybanon <lybanon@earthlink.net> - 2014-02-10 10:12 -0600
  Re: Strange DNS Lookup Problem Barry Margolin <barmar@alum.mit.edu> - 2014-02-10 11:57 -0500
    Re: Strange DNS Lookup Problem Matthew Lybanon <lybanon@earthlink.net> - 2014-02-10 11:48 -0600
      Re: Strange DNS Lookup Problem Sandman <mr@sandman.net> - 2014-02-10 17:54 +0000
      Re: Strange DNS Lookup Problem Warren Oates <warren.oates@gmail.com> - 2014-02-11 07:52 -0500
  Re: Strange DNS Lookup Problem Don Bruder <dakidd@sonic.net> - 2014-02-10 08:59 -0800
    Re: Strange DNS Lookup Problem Lewis <g.kreme@gmail.com.dontsendmecopies> - 2014-02-11 13:56 +0000
      Re: Strange DNS Lookup Problem nospam <nospam@nospam.invalid> - 2014-02-11 10:34 -0500
  Re: Strange DNS Lookup Problem Alan Browne <alan.browne@FreelunchVideotron.ca> - 2014-02-10 16:54 -0500

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