Re:Eventdns: All name servers have failed

[Scott Bennett <bennett@xxxxxxxxxx>]

     On Tue, 20 Apr 2010 05:50:42 -0500 (CDT) I wrote:
>     On Mon, 19 Apr 2010 19:00:20 -0500 David Carlson
><carlson.dl@xxxxxxxxxxxxx> wrote:
>>I am a newbie here, so perhaps this is an overly naive response to this
>
>     All of us have been at some point.
>
>>subject.
>
>     Your discussion below presents one plausible explanation.
>>
>>I am using Windows XP and I am behind a digital modem provided by AT&T. 
>>  That modem is the DNS for my local network.
>
>     Does your LAN have any non-Windows systems on it on which you might
>more easily run a name server of your own?
>>
>>I see that message at times when I think that AT&T is re-booting that=20
>>modem (lately that is at least once a night), which would make the DNS
>
>     Why do you think that is happening?  Does it have a column of lights
>that show a distinct pattern when the modem is reinitializing itself?
>
>>un-available for a short time.
>
     I see I thoroughly garbled the following sentence (aarrghh...).

>     Another possibility is that the other end of the connection is on
>an ISP subnet that is momentarily flooded with traffic, resulting in your
>LAN's queries or the ISP's name server's responses from completing their
                                                    ^^^^^^^^^^^^^^^
That should read, "failing to complete".  Apologies for the noise.

>trips before the timeout period expires.  The default timeout period for
>DNS queries these days is normally only 3 s.
>>
>>I am sure there are other possible causes, but when this is suspected, I
>>
>>would just let the notes fill up the log.
>>
>     It's certainly worth further investigation.  A phone call to the ISP
>to find out what its policies and practices are about daily reboots and
>so on might be well worth your time.


                                  Scott Bennett, Comm. ASMELG, CFIAG
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