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Re: Is my home network set up right?

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Thanks MT.

On 02/26/2012 12:25 PM, Moe Trin wrote:

> No information on intermittent errors = no answer possible

Fair comment.  The explanations are fairly long, but here is the most 
succinct that I can describe them.

Two different cases:
One.
We were shopping for a vacation on www.cheaptickets.com.  Halfway 
through the shopping selection screens, it would suddenly reroute us to 
www.vast.com , a nondescript site that looks like one of those you get 
when it can't serve the page you requested.

This happened numerous times, on 3 different computers, Windows 7, 
Kubuntu Linux and Mandriva Linux, but was rather unpredictable as to 
when in the process that it would happen.  Restarting, rebooting, etc. 
didn't help.

I eventually used a work machine that connects the same wifi router, but 
then VPN tunnels to my work site, and it worked fine.

I have to think that it was something that my ISP (The Big US Cable 
Company that owns the Big US TV Network) was doing in their routing, but 
I can't imagine why.  A similar re-routing happened months ago on a 
completely unrelated site.

Two
While I am browsing Reddit from the laptop (1st laptop, often frequently 
used for this activity), I will often follow links to imgur.com.  After 
some number (subjectively a dozen or two), I will suddenly start to get 
404 errors on the imgur pages, or else imgur will display the frame of a 
picture, but never fill in the image.  I contacted imgur tech support, 
and they suggested a DNS problem.  This problem never happens on the 
primary desktop.

>
>> Here is how I am set up. The DNS set on the Linux machine may be
>> redundant, since I hope that my router provides DNS to the house.
>
> Meaning on laptop1 you can ask about laptop2 and the router provides
> the DNS data - yeah, that's often the case, but it depends on how you
> set up the router.   Did you read the documentation about that?

IIRC, they really don't discuss Linux in their setup options.  They seem 
to think that M$ rules the world.

>
> What kind of "bad reports"?  Slow?  Providing wrong answers?    While
> those two 4.2.2.x hosts are "public" DNS servers, it's usually smarter
> to use your own.   You have to also think that DNS servers "out there"
> don't know anything about your local network, and will therefore return
> NXDOMAIN if asked about them.  That breaks things.  You should be using
> the appropriate tools to investigate your DNS problems - even something
> like 'tcpdump', 'ethereal', or 'wireshark' will show _which_ DNS server
> you are asking, and what response you are getting.  There are also the
> regular DNS testing tools:

Here's one such bad report.  BigCableCo did not resolve correctly, but 
Google DNS did.
https://supportforums.cisco.com/thread/2126556

>
During this week, I will experiment with your other suggestions.  Thanks 
for taking the time to help.

JimR

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Thread

Is my home network set up right? JimR <NotReallyMyEmail@example.com> - 2012-02-25 13:42 -0500
  Re: Is my home network set up right? Richard Kettlewell <rjk@greenend.org.uk> - 2012-02-25 19:03 +0000
    Re: Is my home network set up right? JimR <NotReallyMyEmail@example.com> - 2012-02-25 14:46 -0500
      Re: Is my home network set up right? Pascal Hambourg <boite-a-spam@plouf.fr.eu.org> - 2012-02-25 23:00 +0100
        Re: Is my home network set up right? JimR <NotReallyMyEmail@example.com> - 2012-02-26 11:18 -0500
          Re: Is my home network set up right? Pascal Hambourg <boite-a-spam@plouf.fr.eu.org> - 2012-02-26 20:09 +0100
      Re: Is my home network set up right? Richard Kettlewell <rjk@greenend.org.uk> - 2012-02-26 19:53 +0000
      Re: Is my home network set up right? General Schvantzkoph <schvantzkoph@yahoo.com> - 2012-02-27 15:49 +0000
  Re: Is my home network set up right? ibuprofin@painkiller.example.tld.invalid (Moe Trin) - 2012-02-26 11:25 -0600
    Re: Is my home network set up right? JimR <NotReallyMyEmail@example.com> - 2012-02-27 00:29 -0500
      Re: Is my home network set up right? ibuprofin@painkiller.example.tld.invalid (Moe Trin) - 2012-02-27 21:31 -0600

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